great video, ive always loved gear hobbers but could never really find a decent video that has a clean and concise walk through of the process. you guys got another subscriber.
Thanks Andrew. I took a couple short videos with my phone to show family and friends what I learned at the Evolvent Gear School. Now I can show them this video which demonstrates the process in a much clearer way. Naburian Rocks!!! Norm in Arizona
Nice video, you have a wonderful approach teaching. Please also mention that we have to set the helix angle 2deg43mn of the hub so the tooth are strait
Hi, well done and explained the process many youth should need to learn these processes, envelope arrived opens live in an up coming video. We are enjoying your videos learning a lot love watching the machines making those gears. Hey those buy/rent hobs, can those hob tool cutters be re-sharpened? Thank you, Lance & Patrick.
could you guys do a video about the choice of material used? Like what type of steel to use based on what kind of application. when and why you would use a certain type of steel? when hardened and ground gears would come into play? one last thing, how hard of a steel could you cut with a hobber? Could you possibly cut a gear with a hardness of anywhere around 40-50 rockwell? or is that where grinding comes into play? thank you.
Great question - I will put it on the list. Generally, the hob bits are used on annealed alloy steels. Anything too hard and it can damage the bit. From a process standpoint to achieve a very hard high precision gear there are many steps. On the metallurgy side ONE method/alloy is to 1) hob annealed 4140 at RC32 yield strength is already high at 130,000psi with (stock to leave) 2) harden to RC 52 (yield rises to 219700 psi with proper processing) 3) Grind final involute profile to tolerance A few interesting topics on materials are strength and also how repeatable the process is in the hardening phase, how deep to harded etc. Skiving is another process altogether an can be done on hardened materials. Check out Gleason- www.gleason.com/en/products/machines/cylindrical/power-skiving/the-gleason-power-skiving-approach
can you mayby do a video of testing the gear? like run out and how you measure if a gear can meet the specifications of like a class 10 gear for example?
We use a Vari-Roll system for our spur and helical gears, and a similar gear rolling mechanism for our bevel gears. AGMA old 10 or AGMA new 10? Sure I can post this one fairly soon. Thank you for your interest and watching.
Hey! Thanks for answering my question on machine constant it helped a lot. Do you have any resources on figuring out feeds and speeds for cutting a gear based off of material. For instance what feeds and speeds to cut a gear out of 4130 or 4340 steel.
There are not many resources out there and I it would have a lot to do with the hob material and coatings. The main manufacturers of Hobs are Tru-Volute (Japan), Star Su (China) , Gleason (NY). Since there are very focused gear shops for very specific materials etc, I am sure they are optimized, but they have no need to share with others. Stay tuned on this one as we are gathering this data ourselves. The range for steels is pretty big at 65-115 ft/min for the older HSS like M2 and M4-M42 hobs. Basically, the newer hobs have coatings that really extend the life of the cutters. Usually they require higher cutting speeds++. If you find anything please let the channel know. Great Question.
The video is "on the list", the worm can be made in our Okuma or other lathe that can be setup or programmed to cut a diametral or circular pitch. The worm gear can be made on any of our hobbers either with a single flycyutter, or with a worm hob.
![Seungmin "그렇게, 천천히, 우리(As we are)" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/kAzmhLHePqU/mqdefault.jpg)
great video, ive always loved gear hobbers but could never really find a decent video that has a clean and concise walk through of the process. you guys got another subscriber.
Glad you liked it!
Thanks Andrew. I took a couple short videos with my phone to show family and friends what I learned at the Evolvent Gear School. Now I can show them this video which demonstrates the process in a much clearer way.
Naburian Rocks!!!
Norm in Arizona
That is awesome!
Nice video, you have a wonderful approach teaching.
Please also mention that we have to set the helix angle 2deg43mn of the hub so the tooth are strait
Great tip!
This was great. Thank you!
Glad you enjoyed it! Stay cool in AZ
Please make a video on spiral bevel gears
Hello Andrew,
Cool video, I enjoyed it very much, thank you.
Take care.
Paul,,
Glad you enjoyed it
Can you explain full concept including calculation and and setting up.....
Beautiful and very informative. Thanks a million
My pleasure!
Hi, well done and explained the process many youth should need to learn these processes, envelope arrived opens live in an up coming video. We are enjoying your videos learning a lot love watching the machines making those gears. Hey those buy/rent hobs, can those hob tool cutters be re-sharpened? Thank you, Lance & Patrick.
Glad you liked it. YES, you can resharpen the hobs and if you slide them on the hob arbor between batches of gears you can even out their wear.
could you guys do a video about the choice of material used? Like what type of steel to use based on what kind of application. when and why you would use a certain type of steel? when hardened and ground gears would come into play? one last thing, how hard of a steel could you cut with a hobber? Could you possibly cut a gear with a hardness of anywhere around 40-50 rockwell? or is that where grinding comes into play? thank you.
Great question - I will put it on the list. Generally, the hob bits are used on annealed alloy steels. Anything too hard and it can damage the bit.
From a process standpoint to achieve a very hard high precision gear there are many steps. On the metallurgy side ONE method/alloy is to
1) hob annealed 4140 at RC32 yield strength is already high at 130,000psi with (stock to leave)
2) harden to RC 52 (yield rises to 219700 psi with proper processing)
3) Grind final involute profile to tolerance
A few interesting topics on materials are strength and also how repeatable the process is in the hardening phase, how deep to harded etc.
Skiving is another process altogether an can be done on hardened materials. Check out Gleason-
www.gleason.com/en/products/machines/cylindrical/power-skiving/the-gleason-power-skiving-approach
@@EvolventDesign thank you very much :)
Great work.. Can I make a 23 tooth gear differentially without using the number 23 or its multiples?
23 is a prime number - probably not
can you mayby do a video of testing the gear? like run out and how you measure if a gear can meet the specifications of like a class 10 gear for example?
We use a Vari-Roll system for our spur and helical gears, and a similar gear rolling mechanism for our bevel gears. AGMA old 10 or AGMA new 10? Sure I can post this one fairly soon. Thank you for your interest and watching.
@@EvolventDesign it doesnt matter, what ever is convenient for you. thank you very much.
Hey! Thanks for answering my question on machine constant it helped a lot. Do you have any resources on figuring out feeds and speeds for cutting a gear based off of material. For instance what feeds and speeds to cut a gear out of 4130 or 4340 steel.
There are not many resources out there and I it would have a lot to do with the hob material and coatings. The main manufacturers of Hobs are Tru-Volute (Japan), Star Su (China) , Gleason (NY). Since there are very focused gear shops for very specific materials etc, I am sure they are optimized, but they have no need to share with others. Stay tuned on this one as we are gathering this data ourselves. The range for steels is pretty big at 65-115 ft/min for the older HSS like M2 and M4-M42 hobs. Basically, the newer hobs have coatings that really extend the life of the cutters. Usually they require higher cutting speeds++. If you find anything please let the channel know. Great Question.
How do i figure out machine constant if it is not listed in my manuals.
Watch this
ruclips.net/user/shortsvXuO0fzb-YY?feature=share
At the beginning I thought it seems a Pfauter and it is! 👍👍
Yep, we are full of Pfauters over here. Are you part of PfauterNation too?
Not sure if you’ll see this. But I got a question. So at my job we make flexspine what’s the best way to two pin to find my highest number
Need a little more info - send me a note
andrew@evolventdesign.com
send me a note to
contact@evolventdesign.co
contact@evolventdesign.com
Send a note to contact@evolventdesign.com
Would like to know more about your question to answer it properly
Do you also hob timing belt pulleys? I was wondering if there are GT2 timing belt hobs available.
Yes, familiar with the Power Grip GT hobs from 2mm up to 5mm sizes. Would need to check on GT2. Send me an email ....
How about a worm gear and wheel?
The video is "on the list", the worm can be made in our Okuma or other lathe that can be setup or programmed to cut a diametral or circular pitch. The worm gear can be made on any of our hobbers either with a single flycyutter, or with a worm hob.
Sir I am working on hobbing machine but I can't figure out what to cut helical gear please help me please sir I want to learn calculation
We are working on this for a future video.
How many gears should be set for hobbing machine ratio 24
115 teeth cutting
Use our calculator
evolventdesign.com/pages/change-gear-calculator
ruclips.net/video/VlqObNS9dLA/видео.html
Hello sir
I want to know more about the data can you help me out here please?
Sure-send me an email
@@EvolventDesign Can I get your email id? So that we can converse
@@nachikachoriya4242 look here
evolventdesign.com/pages/contact
Also
instagram.com/p/CVTV6pqFD0i/?
Also for calculators
evolventdesign.com/pages/resources
What a hobbing good video!!!
Thanks for watching Danny. I appreciate your consistent views and comments.
I am sure this is the only video on RUclips 😢
Here's how we re-sharpen those hob cutters with wire EDM
ruclips.net/video/waRB6W0Ypmk/видео.html
101 z index