Needs Pictures: 0
Results 16 to 23 of 23
-
28th Sep 2018, 11:56 PM #16Golden Member
- Join Date
- Apr 2018
- Location
- Drouin Vic
- Posts
- 633
The bicycle potter's wheel from which I borrowed the idea for my project had 3D printed bevel gears https://www.youtube.com/watch?v=uHj_BysG4Ww
-
29th Sep 2018, 06:54 AM #17
Hi Bill,
I assume so. Probably secured by a knurl or spline on the shaft. One shaft is plain and used by the drill driving it, and the other has a 3/8" X 24 BSF thread on it that fits the supplied chuck. There isn't any bearings other than those that are part of the cast housing.
Actually its a quite nice copy of a 3/8" (10 mm) Jacobs keyed chuck ! Which, tongue in cheek, was the reason I bought it.
I mean where can you get a chuck, with a key, for no more than £4.49... with a right angle drive thrown in.Best Regards:
Baron J.
-
29th Sep 2018, 08:38 PM #18Gear expert in training
- Join Date
- Aug 2008
- Location
- Melbourne
- Age
- 34
- Posts
- 1,075
I think powder metallurgy is more likely than a molten cast, it's used quite widely for small gears now.
-
7th Oct 2018, 11:03 PM #19Golden Member
- Join Date
- Nov 2010
- Location
- Gippsland Victoria
- Posts
- 733
Had a go at bevel gears -
I had a go.
Made a mess but they do work after a fashion. Learned how to make expanding mandrels along the way. Made a mandrel to hold the chuck on the dividing jig.
The next pair will be a lot lot better. Will either make or buy a new cutter - some are absurdly cheap nowadays - saw some gearcutters on ebay for only $10ish yesterday.
Some photos attached.
The Ivan Law book was very difficult for me to understand - had to read it several times. The notes below and photo, when considered along with the book, may help other folk have a go.
1. 20 tooth bevel gear needs an 80 division dividing setup. First pass is to cut on every 4th mark - go round the whole blank cut all 20 gaps.
2. Lower the cutter by the calculated amount and rotate the blank by 1/4 tooth so that the lowered cutter aligns with the gap at thin end of teeth - for me that meant lowering the cutter by 1.1mm and rotating the blank clockwise by 1/4 tooth (1 division) and then going round all the pink marks (see photo) and shaving one edge off of the teeth.
3. Raise cutter by calculated amount and then go round all the green marks - shaving the other edge of the teeth - see photo
My blank moved, I forgot to tighten the dividing jig enough or maybe the plate slipped, and the result is you can clearly see that the teeth are skewed on one of the wheels - think I also messed up the centering on the second blank - but they do engage and whirl eachother around - which I thought was fairly surprising given the various mistakes and sloppy end product. https://www.youtube.com/watch?v=16xu...ature=youtu.be - horrible video but proof of gears meshing.
My cutter wasn't wide enough - at the fat end the teeth ended up much wider than the slots and I had to cut the wheels down to a much smaller diameter to get the slots and teeth lined up properly - this is explained in the book but I took a punt and used my pre-existing cutter and got it wrong.
Ended up not using the setup in the attached photos - too much overhang/stickout - used an expanding mandrel with the blank mounted as close as possible to the block - the main ideas are still the same.
Thoroughly enjoyed learning how to do this and will do a far better job next time.Last edited by steamingbill; 7th Oct 2018 at 11:08 PM. Reason: added photo 7
-
8th Oct 2018, 11:17 PM #20Diamond Member
- Join Date
- Sep 2006
- Location
- Australind , WA
- Age
- 58
- Posts
- 1,277
-
9th Oct 2018, 08:37 AM #21Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 1,894
-
9th Oct 2018, 08:15 PM #22Gear expert in training
- Join Date
- Aug 2008
- Location
- Melbourne
- Age
- 34
- Posts
- 1,075
-
10th Oct 2018, 09:23 AM #23Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 1,894
Similar Threads
-
Broken bevel gear tooth repair
By StrayAlien in forum METALWORK GENERALReplies: 22Last Post: 22nd Aug 2017, 10:57 PM -
This a good thing or a bad thing?
By Old Hutcho in forum METALWORK GENERALReplies: 17Last Post: 5th Jan 2014, 05:36 PM -
Bevel Gears and Helicopters
By Anorak Bob in forum METALWORK GENERALReplies: 15Last Post: 7th Jan 2013, 12:14 AM -
Best way to Bevel Pipes with Grinder
By StartedwithaTIG in forum WELDINGReplies: 11Last Post: 4th Jul 2008, 02:21 PM -
Rotary to Bevel Stainless Steel ??
By mayers2007 in forum METALWORK GENERALReplies: 5Last Post: 17th Nov 2007, 08:42 PM