Hi,Mr. Pete,I have a shop rebuilding machines, mostly old school restoration,some new.I build alot of old lathes,mills,various grinders by stripping them down,powder coat,scrape them back to high tolerances and sometimes have to make new gears or sets for the machines I do along with parts. Your videos have helped me teach my dad a lot,and he is now rebuilding with me.I just wanted to thank you for your time teaching others with your great videos,without great guys like you teaching,my dad wouldn't be working with me everyday.He learned alot from you and I am greatful that he loves watching your videos and learning,he loves rebuilding older lathes in his retirement years,I could never have taught him what you have.Thank You for being you
Coming from the gear industry having worked for David brown,Renold crofts and Siemens gear and power transmission manufacturing this is and excellent introduction to gears and gear cutting Thank you Mr Pete for doing this
Excellent once again. Thanks for the very informative video. I look forward to the rest of the series. You are a teacher par excellence. regards from the UK
ANother Excellent video Mr Pete. I enjoyed your road trip videos but these in-depth videos are what brought me to your channel and what keeps me coming back, really looking forward to the rest of the series, keep them coming!!!!!!!!!!!
Gears and Gear Cutting by Ivan Law is my main source for the hundreds of gears I've made in my shop. Available even on eBay. Another excellent video and anxiously await the rest of this series.
Hi mrpete, Even if I cut gears once in a while, this time I'll take notes, it will be better than to search every time from scratch or just about.. Thanks for the trouble, don't tell us you are retired, you're still teaching this present bunch sitting in front of the Tube.... Pierre
I am so looking forward to this series Mr. Pete. Thanks for sharing. I recently picked up a horizontal mill, smallish benchtop machine and I hope to be able to cut gearsa on it. Your help via these videos will be greatly appreciated.
Thank you for a another educational video people like you who make these type of videos make sure that manual machining keep going for the new generation of machinist .
Oh this video brings back memories of teaching in the drafting (mechanical by hand) and having the students draw gears, and draw two gears intersecting... The students really loved the challenge of process... Gosh I miss teaching that class... Awesome video as usual
Thanks for making these videos, love them. I'll be making some gears for my lathe to cut metric thread and really large threads as the 4 gears needed would cost me over $600 from the dealer! So learning something new and saving $$$ is the motivation
Great summary of what seems a very complicated subject. Growing up in the late 50's and mid 60's shop classes were considered for the guys who weren't too bright. I was one of those guys who loved shop yet was told I was college material, all I ever wanted was out of school and a job. Watching these videos I could easily argue that without a solid grasp on math and some logical thinking a guy would never make it through this class.
another nice video but i must tell ya that 1/2 the gears u said u cant make in the home machine shop is wrong i my self have made a few worm gear sets for my telescopes and work better then boughten gears and even made a 27" rack gear on my wells index mill and some searching on youtube will show how to do them and more. any way keep up the good work on the video and thanks for the time put in to them thanks josh
I can only imagine that after the first day's work using the divider at the Ford Museum most trainees rushed to jump off the nearest bridge. Another great video.
I sure wish there had machinist classes at my high school. It is an amazing skill and one even best learned when young. I still wish I had some exposure to it.
Thanks Mr. Pete, this was a great foundation for what Keith showed us a while back with his A/D series. Particularly got a lot out of the cutter specs, but am curious now how they are made...makes me think of the chicken or egg conundrum! They must be ground with some kind of profiler I imagine, but would love to hear about that somewhere in your series if you would be so kind. Giggled at your "I Lied"! Thanks for all you share with us...it's a better world because of it!
Mr.Pete,if there is things you need for your shop,my shop has tons of spare machine parts,tooling ect.from rebuilding and buying a lot of machine tools.I have a lot of vintage factory parts,machines, from all brand name lathes to old school whatever. I have collected over the years buying shops out.I would be happy to help you in any way I can.Me and my father love what your about and what you do for the metal cutting industry,Thanks,John H.-HHK Ind.Machine
I remember when I was younger, and didn't have access to a good milling machine, when I used to hand-file gears from brass for my little 'inventions'. Really, for a sharp-toothed spur gear, all you need is the right material (brass works well) and a good triangle file, if you are making smaller devices. Larger you go, of course, the bigger machines and brawnier materials you will need.
I enjoyed your video. Thank you. You said that some of the gears can't be made at home. I can't make a worm gear as big as a man. But I can make one as big as his finger. No problem. I can make some of the other gears too. I can also make a mistake half way through and swear about it😊 I think that the hardest part about making gears is maintaining concentration. Best wishes.
mrpete.....what more could we say....Thank you.... retired....I don't think so, GREAT instruction. And thanks for the laugh at about 21 mins... reading up on pressure angles.. cause that's complex stuff..haha..thanks mrpete your #1.
I would like to ask you have you ever bought a round blank that is the thickness of a gear cutter and made your own gear cutter I mean you can see looking at one that they are milled from a blank all you would NEED to know is what grade of steel blank to buy
Hoped you would throw it into this video but i missed it. What about using the module numbering for gear sizes? It is virtually the same as dp,the cutters in module numbering are more affordable.
I've been doing it wrong I guess because it's a lot more work and fiddly setup than the regular way, but I found a way to get the correct involute tooth shapes, exactly, without having a whole set of gear cutters. I set a simple 14 1/2 degree trapezoidal cutter up with its axle perpendicular to the gear arbor, and move the arbor across it while rotating the arbor to present the same gear tooth to the cutter as the angle changes. The movement ratio is determined by the pitch diameter and arbor movement, the same as meshing a gear on the same arbor as the one being cut, along a gear rack one tooth of which is the cutter.
Thanks a lot for that video, can you do me a favour and check the tolerance of the blades? My cheap gear cutter has a tolerance of +/-20microns. They should be re-ground but my machinery is a bit limited (I have an NC machine).
Great video, Mr. Pete. Thanks so much. Is there such a thing as metric gears? If so, is there a different set of formulas for computing the P, etc.? Thanks in anticipation of your answer.
Yes there is a metric gear system also. It is known as the "M" series of gears and there are many more pitches than the Imperial series. If you are really wanting to do gears then I would highly recommend getting a machinery's handbook and read it. It is a wealth of knowledge for beginners and a necessity for any type of precision work in the home shop.
Let me recommend the book "Gears and Gear Cutting" by Ivan Law. Cannot be over emphasized. You'l be very glad you did! The section on cutting bevel gears (yes, on a Bridgeport!) is worth the price of the book alone.
If I wanted to cut 2 meshing spur gears, One at 1" 18T and 3.75" 72T, by that calculation I need a 20P cutter. But does this mean that I would need to use the B&S #6 on the 18T gear and then use a #2 for the 72T? What I'm asking is that the same cutter can't do both because they mesh with each other anyway? Thanks,
Hello, Mr Youtubal, thanks for the video. I have seen you set the cutter on the centre line elsewhere, but can we always be sure that the centreline of the cutter is exactly centred between the faces?
Hi Mr. Pete. I have a quick question: If the second formula uses the Outer Diameter (O.D.) what diameter (D) is the first formula using? Obviously they can't be the same (according to the formulas) so I'm a bit confused. Thanks for the videos. I almost always learn something and enjoy them all.
mrpete I'm a bit confused. You illustrate Pitch = N+2/D (time lapse13.48) and Pitch = N/D (time lapse 19.48). Why two different formulas, one with number of teeth +2 and one with just number of teeth? At 19.48 you say diameter, I think you mean diameter of the pitch circle. I did the math, a 40 tooth gear with a diametral pitch of 18 has a pitch circle diameter of 2.222 (40/18=2.222) and an outside diameter of 2.333 (42/18=2.333) or O.D.= N+2/P which your calipers prove. I see below I'm not only one confused by this. When mentioning diameters its best to emphasize pitch circle diameter and outside diameter. The number of teeth +2 formula compensates for the difference in pitch circle and outside diameters which allows for a whole number of diametral pitch. I don't mean to be long winded here, I always learn something new from your videos and appreciate them. Keep em coming!
@@mrpete222, I'll be the judge of that. lol Great vid mind. You deserve an 'Oscar'. Not just for the information imparted but also for the quality of your presentation and filming technique. Can I just say the curved face on gears is there for a reason. It's geometry ensures that at any particular moment three teeth are bearing the load with middle tooth taking most but with it building up and then diminishing on the teeth either side of it. To see this demonstrated with two (teaching aid) Perspex gears where light is refracted into spectrums as the load point moves along the curved faces is a beautiful thing to behold. Keep up the good work.
At 13:47 When your Dividing the number of teeth by the Diameter to determine the diametral pitch, is that the outside diameter or the pitch circle diameter your using there?
Take what I say with a grain of salt. I paused his video freqently and took notes. I believe he said pitch circle. Also I believe this is the reason for the + 2 in the equation. The +2 compensates for the top half of tooth that is not included in the diameter when dealing with the circumfrence of the pitch circle. I may be wrong.
@@normtheteacher5485 It's always weird getting a reply to a comment I made years ago. It's the number of teeth + two divided by the outside diameter. The other way to do it is: number of teeth divided by the pitch diameter (pitch circle diameter). I checked with one of my books. Since I watched this video three years ago I have designed and machined some gears myself.
@@mastercreator07 thank you for setting me straight. I was getting ready to machine a blank to make my first gear. I will recalculate and cut the blank with the correct diameter.
I have a question about something I am trying to make. I have a treadle sewing machine base with a large wheel. I want to make it into a spinning wheel. To do this I need to change the direction at which the top wheel(part of the spinning apparatus) spins from the large wheel attached to the foot treadle. The large wheel will be treadled to my right side and when the drive belt comes through the top platform where I want to put the spinning device I will have to change the direction of the spin 90 degrees so that I am facing the spin. I am thinking a worm gear is what I need to use but I need some help...I think the worm gear would be to slow for spinning. I hope I have made myself clear enough and I will appreciate any help...Thank you
sure you can, but you need a dividing head of the appropriate physical size. I have a small Ellis DH about 9" tall, weighs about 25 pounds, that will fit on the table of my South Bend 7" Shaper. Tell you what though, assuming you had a dividing head that physical size will work with your shaper: It's about the only homeshop machine *_that can cut internal gears !!_* You just need to grind the shaper cutter to the right gear tooth profile. think about it: what other machine tool do you have that can do that? Or internal splines for that matter?
This is the video that I expect for the last five years. Many exist, but as always you are THE TEACHER. You are here talking about the dividing head, but what about the turntable, except that it's a 90:1 ratio. You presented the bevel gear. I hope that you will have a video on it. Why would ask?. Nowhere else I can't find a way to cut a bevel gear to make a drill chuck key. I g. I owned an old Jacob 16N drill chuck, but no key I have. So, I want to make one, but in order to make it, I need to know how to set the dividing head (turntable). Nowhere on RUclips™ I was able to find an "How to" on this specific subject. As always, please accept my warm regards for your dedication. SpellCheckPlus.com grammar and spelling checker
Robert Patoine Get the Ivan Law 'Gears and Gear Cutting' book as mentioned elsewhere in the comments. It has a section on cutting bevel gears (incorrect tooth form, but quite workable).
Paul Compton I must get a copy. I wish I would have had that book a few weeks ago. Now I am essentially done with all 10 gear videos.. Those UK books are great.
Hi Mr. Compton, Indeed, this is a great book for great machinist. I have it!. But I am not a machinist! So I will send the book to young Mr. Pete, it's the lead that I can do for him. I understand but can't really understand. It's easier to look at Mister Pete videos. Even if ho don't make a video out of it, I am sur that it will be for him, a good bed side book. Thanks SpellCheckPlus.com grammar and spelling checker
I think your last equation should be N = D x P - 2. You were adding 2 to the number of teeth before, so you'll need to reverse that. In fact, it's the second equation in the list of equations at the end of the video. It's easy to see this as the algebra is pretty basic. Maybe someone below already mentioned this.
I think one needs to be careful with nomenclature when quoting formulae like these. The first formula P=N/D is correct IF P is the Diametral Pitch, N is the Number of Teeth and D is the Pitch Diameter. In reality most machinists are not concerned with the Pitch Diameter and it's the Outside Diameter which is relevant. In that case the formulae should actually be: P=N+2/D or D=N+2/P or (as Jay Williams pointed out) N=(DxP)-2 where D is actually the Outside Diameter
''the pitch circle is very important''.....Why, what for ? I have cut about 1500 gears in my career over 45 years, part time work.......and have never used the pitch circle or pitch diameter or circular pitch for anything...even if i had to ''conjure up'' a missing gear.......only used DP or module, OD, tooth count and center distance.
Наука
Hi,Mr. Pete,I have a shop rebuilding machines, mostly old school restoration,some new.I build alot of old lathes,mills,various grinders by stripping them down,powder coat,scrape them back to high tolerances and sometimes have to make new gears or sets for the machines I do along with parts. Your videos have helped me teach my dad a lot,and he is now rebuilding with me.I just wanted to thank you for your time teaching others with your great videos,without great guys like you teaching,my dad wouldn't be working with me everyday.He learned alot from you and I am greatful that he loves watching your videos and learning,he loves rebuilding older lathes in his retirement years,I could never have taught him what you have.Thank You for being you
Thank you. That is very heartening to me about your father as I lost mine early.
I'm glad I am helping & good luck in your shop.
I was lucky enough to find these videos in Clickspring.Thank you.
Coming from the gear industry having worked for David brown,Renold crofts and Siemens gear and power transmission manufacturing this is and excellent introduction to gears and gear cutting
Thank you Mr Pete for doing this
good lesson Lyle, glad to see you are keeping it as simple as possible for the home shops.
You're an excellent source of info. Thanks for taking the time to share this with us!
Excellent once again. Thanks for the very informative video. I look forward to the rest of the series. You are a teacher par excellence. regards from the UK
ANother Excellent video Mr Pete. I enjoyed your road trip videos but these in-depth videos are what brought me to your channel and what keeps me coming back, really looking forward to the rest of the series, keep them coming!!!!!!!!!!!
Gears and Gear Cutting by Ivan Law is my main source for the hundreds of gears I've made in my shop. Available even on eBay.
Another excellent video and anxiously await the rest of this series.
THANKS-I;ll have to buy it
That was very interesting and I learnt so much. Your purpose in life was certainly to tech as you do it so well. Am looking forward to seeing more.
Hi mrpete,
Even if I cut gears once in a while, this time I'll take notes, it will be better than to search every time from scratch or just about..
Thanks for the trouble, don't tell us you are retired, you're still teaching this present bunch sitting in front of the Tube....
Pierre
Thanks for appreciating
Great video as always, looking forward to the next in ghe series, thanks mr pete you are a star.
I am so looking forward to this series Mr. Pete. Thanks for sharing. I recently picked up a horizontal mill, smallish benchtop machine and I hope to be able to cut gearsa on it. Your help via these videos will be greatly appreciated.
THANKS
Brilliant video. Very informative. Thank you for taking the time to do this. Much appreciated. David (Ireland)
THANKS
Thank you for a another educational video people like you who make these type of videos make sure that
manual machining keep going for the new generation of machinist .
Oh this video brings back memories of teaching in the drafting (mechanical by hand) and having the students draw gears, and draw two gears intersecting... The students really loved the challenge of process... Gosh I miss teaching that class... Awesome video as usual
Yes--there are many fond memories of teaching
Enjoy learning from you Mr. Lyle, Thanks
Mr Pete, I'll probably never cut a gear, but it's sure nice to learn how it's done.
Thanks for this great series.
I learn more watching your videos than any other. Thanks.
Excellent! Looking forward to future videos on the subject. Well Done
Thanks for making these videos, love them. I'll be making some gears for my lathe to cut metric thread and really large threads as the 4 gears needed would cost me over $600 from the dealer! So learning something new and saving $$$ is the motivation
👍👍
Great video Mr Pete, looking forward to the rest of the series, thanks!
THANKS
An excellent tutorial, many thanks for posting this!
Great summary of what seems a very complicated subject. Growing up in the late 50's and mid 60's shop classes were considered for the guys who weren't too bright. I was one of those guys who loved shop yet was told I was college material, all I ever wanted was out of school and a job. Watching these videos I could easily argue that without a solid grasp on math and some logical thinking a guy would never make it through this class.
👍👍👍
Oh man! Yes! Been waiting for this. Thank you so much. Keep them coming.
THANKS
Great Great video! Thanks for taking the time to make it.
Dale d
You are such a good teacher. Thanks again.
THANK YOU
Another very informative and valuable video. Thanks for providing this information.
another nice video but i must tell ya that 1/2 the gears u said u cant make in the home machine shop is wrong i my self have made a few worm gear sets for my telescopes and work better then boughten gears and even made a 27" rack gear on my wells index mill and some searching on youtube will show how to do them and more. any way keep up the good work on the video and thanks for the time put in to them thanks josh
Mr. Pete, YOU are a great teacher and video maker! Can't tank you enough for the time and effort you put into your videos! Jason
Excellent explanation about spur gears!
I can only imagine that after the first day's work using the divider at the Ford Museum most trainees rushed to jump off the nearest bridge. Another great video.
It is obvious that you know how to teach. Excellent video. Because of the video I successfully made my first gear. Thanks Tubalcain!
I am so glad I helped
Great video. thank you from the UK.
Interesting Series and information Mr Pete. Thanks
Colin ;-)
THANKS
In the name of the new generation of Machinists,we pray with heart and soul ,that your teachings never stops.
Our best regards Mr.Pete
Thanks 🙏
Excellent video, Very informative. Thank you
Great explanation of a complicated subject. Thank you.
Thanks
I sure wish there had machinist classes at my high school. It is an amazing skill and one even best learned when young. I still wish I had some exposure to it.
Thanks Mr. Pete, this was a great foundation for what Keith showed us a while back with his A/D series. Particularly got a lot out of the cutter specs, but am curious now how they are made...makes me think of the chicken or egg conundrum! They must be ground with some kind of profiler I imagine, but would love to hear about that somewhere in your series if you would be so kind. Giggled at your "I Lied"! Thanks for all you share with us...it's a better world because of it!
THANKS for watching. I have no idea how the cutters are made
Thank you.
Enjoyed this series very much.
Later
First of all, congratulations, great video! I was curious... why do we add 2 to the number of teeth to find the diametrical pitch?
An excellent tutorial, Thanks
Mr.Pete,if there is things you need for your shop,my shop has tons of spare machine parts,tooling ect.from rebuilding and buying a lot of machine tools.I have a lot of vintage factory parts,machines, from all brand name lathes to old school whatever. I have collected over the years buying shops out.I would be happy to help you in any way I can.Me and my father love what your about and what you do for the metal cutting industry,Thanks,John H.-HHK Ind.Machine
Thanks for watching, and thanks for the offer. I will keep you in mind the next time I need something.
Another very good video!!!
THANKS
Very Useful, thanks.
I remember when I was younger, and didn't have access to a good milling machine, when I used to hand-file gears from brass for my little 'inventions'. Really, for a sharp-toothed spur gear, all you need is the right material (brass works well) and a good triangle file, if you are making smaller devices. Larger you go, of course, the bigger machines and brawnier materials you will need.
+ReddmanDGZ I bet that was tedious-- Thanks for watching
I enjoyed your video. Thank you.
You said that some of the gears can't be made at home.
I can't make a worm gear as big as a man. But I can make one as big as his finger. No problem. I can make some of the other gears too.
I can also make a mistake half way through and swear about it😊
I think that the hardest part about making gears is maintaining concentration.
Best wishes.
You are right, you better keep your mind on it
mrpete.....what more could we say....Thank you.... retired....I don't think so, GREAT instruction. And thanks for the laugh at about 21 mins... reading up on pressure angles.. cause that's complex stuff..haha..thanks mrpete your #1.
Excellent info!
im off to watch it again,,
THANKS
really enjoy your RUclips video.
Great videos! SMIB, Brother
Was facing off the broken rack, perhaps annealing it first, and then installing a pin an option. Liked the video.
THANKS-yes
thank you. I wish you would talk about a how to measure and make helical gears. would you please think about doing one?
Thank you... I'm beginning to think about making custom portal axles for an old Volvo XC70
I've made worm gears and worms! Was a pain to do but I did it. Got to match the dp and tread pitch to make a worm.
Best information ever, thank you sir
Thanks
Great video Lyle. Ian from wales. Uk
THANKS
Great video thanks!
Great video
Thanks
I would like to ask you have you ever bought a round blank that is the thickness of a gear cutter and made your own gear cutter I mean you can see looking at one that they are milled from a blank all you would NEED to know is what grade of steel blank to buy
Hoped you would throw it into this video but i missed it. What about using the module numbering for gear sizes? It is virtually the same as dp,the cutters in module numbering are more affordable.
I am unaware of these.
I've been doing it wrong I guess because it's a lot more work and fiddly setup than the regular way, but I found a way to get the correct involute tooth shapes, exactly, without having a whole set of gear cutters. I set a simple 14 1/2 degree trapezoidal cutter up with its axle perpendicular to the gear arbor, and move the arbor across it while rotating the arbor to present the same gear tooth to the cutter as the angle changes. The movement ratio is determined by the pitch diameter and arbor movement, the same as meshing a gear on the same arbor as the one being cut, along a gear rack one tooth of which is the cutter.
Thank you, sounds like a great technique
great! thanx for video
+SAURABH KUMAR Thanks for watching
Easy to understand
Also, I have sets of metric cutters that are numbered the opposite way round-ie No. cuts 12-13 teeth.
Do you have a video out of how to cut a helical gear on a Bridgeport?
Thanks a lot for that video, can you do me a favour and check the tolerance of the blades? My cheap gear cutter has a tolerance of +/-20microns. They should be re-ground but my machinery is a bit limited (I have an NC machine).
Great video, Mr. Pete. Thanks so much. Is there such a thing as metric gears? If so, is there a different set of formulas for computing the P, etc.? Thanks in anticipation of your answer.
Yes there is a metric gear system also. It is known as the "M" series of gears and there are many more pitches than the Imperial series. If you are really wanting to do gears then I would highly recommend getting a machinery's handbook and read it. It is a wealth of knowledge for beginners and a necessity for any type of precision work in the home shop.
Thanks so much for your reply, Iton Stick...
Let me recommend the book "Gears and Gear Cutting" by Ivan Law. Cannot be over emphasized. You'l be very glad you did! The section on cutting bevel gears (yes, on a Bridgeport!) is worth the price of the book alone.
Where might one find that book, I am not familiar with it
If I wanted to cut 2 meshing spur gears, One at 1" 18T and 3.75" 72T, by that calculation I need a 20P cutter. But does this mean that I would need to use the B&S #6 on the 18T gear and then use a #2 for the 72T? What I'm asking is that the same cutter can't do both because they mesh with each other anyway?
Thanks,
Dave Seff you need 2 diff cutters
Excellent, thank you. jh
is there any quick reference for the gears in a South Bend 9 apron? or is it that you just need to measure the gear you need to replicate?
No reference that I am aware of
So there are other numbers other than 2.157, and is this always used standardly?
Hello, Mr Youtubal, thanks for the video. I have seen you set the cutter on the centre line elsewhere, but can we always be sure that the centreline of the cutter is exactly centred between the faces?
My mouth is good enough. But you could use indicators to get even greater accuracy
I meant my method is good enough
Tubalcain, great info and videos. As an aside, are you a Master Mason and if so what lodge?
THANKS--no
Thank You
Thanks !!!
Hi Mr. Pete. I have a quick question: If the second formula uses the Outer Diameter (O.D.) what diameter (D) is the first formula using? Obviously they can't be the same (according to the formulas) so I'm a bit confused. Thanks for the videos. I almost always learn something and enjoy them all.
Actually D & OD are the same.
mrpete222 here's the source of my confusion:
if P=N/D then D=N/P, and if D=OD , then N/P= (N+2)/P, which can not be true.
Rod Joyner The formula D=N/P is using the pitch diameter of the gear.
The other one is OD=(N+2)/P is using the outside diameter of the gear.
thank you so much dear ,
mrpete I'm a bit confused. You illustrate Pitch = N+2/D (time lapse13.48) and Pitch = N/D (time lapse 19.48). Why two different formulas,
one with number of teeth +2 and one with just number of teeth? At 19.48 you say diameter, I think you mean diameter of the pitch
circle. I did the math, a 40 tooth gear with a diametral pitch of 18 has a pitch circle diameter of 2.222 (40/18=2.222) and an outside
diameter of 2.333 (42/18=2.333) or O.D.= N+2/P which your calipers prove. I see below I'm not only one confused by this.
When mentioning diameters its best to emphasize pitch circle diameter and outside diameter. The number of teeth +2 formula
compensates for the difference in pitch circle and outside diameters which allows for a whole number of diametral pitch.
I don't mean to be long winded here, I always learn something new from your videos and appreciate them. Keep em coming!
How can you tell a 14.5 PA gear from a 20 PA gear?
Can you explain why you add 2 to the number of teeth to find the diametrical pitch please?
Because it’s in the formula. You do not need to know why
@@mrpete222, I'll be the judge of that. lol Great vid mind. You deserve an 'Oscar'. Not just for the information imparted but also for the quality of your presentation and filming technique. Can I just say the curved face on gears is there for a reason. It's geometry ensures that at any particular moment three teeth are bearing the load with middle tooth taking most but with it building up and then diminishing on the teeth either side of it. To see this demonstrated with two (teaching aid) Perspex gears where light is refracted into spectrums as the load point moves along the curved faces is a beautiful thing to behold. Keep up the good work.
At 13:47 When your Dividing the number of teeth by the Diameter to determine the diametral pitch, is that the outside diameter or the pitch circle diameter your using there?
Take what I say with a grain of salt. I paused his video freqently and took notes. I believe he said pitch circle. Also I believe this is the reason for the + 2 in the equation. The +2 compensates for the top half of tooth that is not included in the diameter when dealing with the circumfrence of the pitch circle. I may be wrong.
@@normtheteacher5485 It's always weird getting a reply to a comment I made years ago. It's the number of teeth + two divided by the outside diameter. The other way to do it is: number of teeth divided by the pitch diameter (pitch circle diameter). I checked with one of my books. Since I watched this video three years ago I have designed and machined some gears myself.
@@mastercreator07 thank you for setting me straight. I was getting ready to machine a blank to make my first gear. I will recalculate and cut the blank with the correct diameter.
Was looking at a set of 8 chinese cutters and they all say 16DP 14.5 PA, is that right?
Yes
Bought them. Drillpro brand, $80 for all eight.
I have a question about something I am trying to make. I have a treadle sewing machine base with a large wheel. I want to make it into a spinning wheel. To do this I need to change the direction at which the top wheel(part of the spinning apparatus) spins from the large wheel attached to the foot treadle. The large wheel will be treadled to my right side and when the drive belt comes through the top platform where I want to put the spinning device I will have to change the direction of the spin 90 degrees so that I am facing the spin. I am thinking a worm gear is what I need to use but I need some help...I think the worm gear would be to slow for spinning. I hope I have made myself clear enough and I will appreciate any help...Thank you
Yes--worm would slow it down to nothing. what about bevel gears?
Bevel gear? I don't know what that is but I will look it up. But do you think that may work?
I looked it up...perhaps it will do the job...where would I find one?
Could you cut gears with a shaper if you had to ? thanks
I doubt it
sure you can, but you need a dividing head of the appropriate physical size. I have a small Ellis DH about 9" tall, weighs about 25 pounds, that will fit on the table of my South Bend 7" Shaper. Tell you what though, assuming you had a dividing head that physical size will work with your shaper: It's about the only homeshop machine *_that can cut internal gears !!_* You just need to grind the shaper cutter to the right gear tooth profile. think about it: what other machine tool do you have that can do that? Or internal splines for that matter?
This is the video that I expect for the last five years. Many exist, but as always you are THE TEACHER. You are here talking about the dividing head, but what about the turntable, except that it's a 90:1 ratio. You presented the bevel gear. I hope that you will have a video on it. Why would ask?. Nowhere else I can't find a way to cut a bevel gear to make a drill chuck key. I g. I owned an old Jacob 16N drill chuck, but no key I have. So, I want to make one, but in order to make it, I need to know how to set the dividing head (turntable). Nowhere on RUclips™ I was able to find an "How to" on this specific subject.
As always, please accept my warm regards for your dedication.
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THANKS, but no plans on the bevel
Robert Patoine Get the Ivan Law 'Gears and Gear Cutting' book as mentioned elsewhere in the comments. It has a section on cutting bevel gears (incorrect tooth form, but quite workable).
Paul Compton I must get a copy. I wish I would have had that book a few weeks ago. Now I am essentially done with all 10 gear videos.. Those UK books are great.
Hi Mr. Compton,
Indeed, this is a great book for great machinist. I have it!. But I am not a machinist!
So I will send the book to young Mr. Pete, it's the lead that I can do for him. I understand but can't really understand. It's easier to look at Mister Pete videos.
Even if ho don't make a video out of it, I am sur that it will be for him, a good bed side book.
Thanks
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I think your last equation should be N = D x P - 2. You were adding 2 to the number of teeth before, so you'll need to reverse that. In fact, it's the second equation in the list of equations at the end of the video. It's easy to see this as the algebra is pretty basic. Maybe someone below already mentioned this.
+Jay Williams whoops-thanks
I think one needs to be careful with nomenclature when quoting formulae like these. The first formula P=N/D is correct IF P is the Diametral Pitch, N is the Number of Teeth and D is the Pitch Diameter.
In reality most machinists are not concerned with the Pitch Diameter and it's the Outside Diameter which is relevant. In that case the formulae should actually be:
P=N+2/D
or D=N+2/P
or (as Jay Williams pointed out)
N=(DxP)-2 where D is actually the Outside Diameter
hi sir, do u have screw gear video?
No
no website now? I know this is old video but thought you'd be around forever haha
No more website
at 5:54 are your sure .. that you put the gear at the round chuck. Not on top of the dividing plate.
I'm trying to understand what 'involute' means.
Should read No.1
''the pitch circle is very important''.....Why, what for ? I have cut about 1500 gears in my career over 45 years, part time work.......and have never used the pitch circle or pitch diameter or circular pitch for anything...even if i had to ''conjure up'' a missing gear.......only used DP or module, OD, tooth count and center distance.
I was wondering if any of your former students ever watch and comment on your videos.
Yes-some have & told me about it.
You taste salt water?
To much home work hahaha
A
Thank you