Very well made videos (all three) on this type of indexing jig and your machining is great. I would suggest putting a V at one side of the interior hole so that the workpiece (actually the jig itself) is held stationary at three points instead of just two which could rock just a bit. Keep up the good work!
Now that is another cool jig that will need to be made here one day - you can't get 5-sided ER40 collet blocks from what I have seen, and although pentagons are not as common in what we machine they still pop up every now and again.
Thanks for this mini-series, Lee. Don't forget that you can index 10 from a pentagon by lining up with the square on the face when it is vertical at the back (180 degrees rotation).
Excellent series of videos. Thanks for sharing your knowledge and expertise. I like that you show us mathematically challenged amateur machinists a way to do this with out resorting to log tables or other high math.
These are fascinating gadgets. When I saw the 4-6-8, my initial thought was that you would be claming _that_ in the vise, which probably wouldn't have worked real well with stock that was smaller than the hole. So I was rather surprised when you demonstrated how they were actually used. I can see the first one as being useful, this 3-5 one maybe not so much. My recollecton is that NYC fire hydrants had a five-sided fitting on the top to turn them on, so theoretically you needed a special wrench to do that, but it never seemed to stop people from just using a pipe wrench. :-) Would these obviate the need for square and hex collet blocks? (Still thinking about what tooling I might want to acquire...)
Interesting video, but you've got an oops!! You got the last two digits in your ratio for the pentagon reversed - the ratio is (1-cosine 72)/cosine 54 which is also = 2 x sine 36 = 1.17557050. Rounded to 3 decimal digits ~ 1.176, not 1.167.
As usual an interesting and entertaining video. Thanks for the video and the great explanation.
Very well made videos (all three) on this type of indexing jig and your machining is great. I would suggest putting a V at one side of the interior hole so that the workpiece (actually the jig itself) is held stationary at three points instead of just two which could rock just a bit. Keep up the good work!
Now that is another cool jig that will need to be made here one day - you can't get 5-sided ER40 collet blocks from what I have seen, and although pentagons are not as common in what we machine they still pop up every now and again.
Hello Lee,
A very good video, nicely explained...
Take care.
Paul,,
Thanks for a great series of videos
I will be making a set.
Take care and be safe!
Mr Lee... No More i am now going to call you Mr. Hollywood with the two camera angles. very nice....
Im learning all the time thanks for the video it simplifies the process a lot
Thanks for this mini-series, Lee.
Don't forget that you can index 10 from a pentagon by lining up with the square on the face when it is vertical at the back (180 degrees rotation).
The constants math equation is interesting to me and one day will become of value. I love learning something new, Thanks Lee!!
A tip: watch movies on kaldrostream. I've been using it for watching a lot of movies during the lockdown.
@Karson Donovan Yea, been using kaldroStream for years myself :)
Excellent series of videos. Thanks for sharing your knowledge and expertise. I like that you show us mathematically challenged amateur machinists a way to do this with out resorting to log tables or other high math.
Another great video. I need to make these myself. Thanks for sharing with us. Dan
After watching your last 2 videos I had considered making a 5 and 7 sided version. But ya done beat me to the 5. Love the way you laid this out
These are fascinating gadgets. When I saw the 4-6-8, my initial thought was that you would be claming _that_ in the vise, which probably wouldn't have worked real well with stock that was smaller than the hole. So I was rather surprised when you demonstrated how they were actually used. I can see the first one as being useful, this 3-5 one maybe not so much. My recollecton is that NYC fire hydrants had a five-sided fitting on the top to turn them on, so theoretically you needed a special wrench to do that, but it never seemed to stop people from just using a pipe wrench. :-)
Would these obviate the need for square and hex collet blocks? (Still thinking about what tooling I might want to acquire...)
Thanks for sharing
Interesting video, but you've got an oops!! You got the last two digits in your ratio for the pentagon reversed - the ratio is (1-cosine 72)/cosine 54 which is also = 2 x sine 36 = 1.17557050. Rounded to 3 decimal digits ~ 1.176, not 1.167.
You already have a 3 side jig--just skip sides on the Hex . Better to make a 5 -7-9 jig