David Noble | 03/02/2023 10:16:00 |
![]() 402 forum posts 37 photos | I would like to buy some change wheels for the Mellor lathe that I am attempting to restore. As the Mellor lathe seems to be fairly rare, they are not immediately available, so, as a last resort I could make them but I wondered if anyone knew if there is another lathe with the same tooth form of 16D.P. Many Thanks, David |
Emgee | 03/02/2023 10:40:46 |
2610 forum posts 312 photos | David Colchester Bantam lathe uses 16DP gears. Emgee |
ChrisLH | 03/02/2023 11:17:10 |
111 forum posts 7 photos | You also need to know Pressure Angle, 14.5 or 20 degrees, to get a satisfactory match. |
David George 1 | 03/02/2023 11:18:40 |
![]() 2110 forum posts 565 photos | Hi David you can buy these gears from HPC. https://www.hpcgears.com/stampede/products/spur.gears/spur.gears.php
Worth a look. David |
Lee Rogers | 03/02/2023 11:58:04 |
![]() 203 forum posts | Worth remembering that for fine cutting feeds you can use any set with the correct bore, with a bit of imagination you can compound 2 different sets on the same banjo. |
Martin Connelly | 03/02/2023 12:15:40 |
![]() 2549 forum posts 235 photos | Smart and Brown also use 16DP gears. Here is an original with one I made, 95 teeth. Martin C |
not done it yet | 03/02/2023 12:20:53 |
7517 forum posts 20 photos | We need some more detail. Most Raglan lathes used 16DP gearing. But they may not be the tooth count required, the correct width (spacers may help), or the bore/boss dimensions - and anything else that may be a limiting factor. |
David Noble | 03/02/2023 12:45:22 |
![]() 402 forum posts 37 photos | Posted by not done it yet on 03/02/2023 12:20:53:
We need some more detail. Most Raglan lathes used 16DP gearing. But they may not be the tooth count required, the correct width (spacers may help), or the bore/boss dimensions - and anything else that may be a limiting factor. Thanks everyone, I was prepared to modify the gears if they were from another make but more details are:- 16D.P. 14.5 deg p.a. 3/8" wide, 3/4" bore, 5/32" keyway. I was hoping to buy these second hand as there are quite a lot that are missing and to buy new is looking quite pricey. David Edited By David Noble on 03/02/2023 12:45:52 |
Bazyle | 03/02/2023 14:09:29 |
![]() 6956 forum posts 229 photos | Which gears do you already have? For an 8tpi leadscrew the 'best' set is 11 wheels in steps of 5 teeth from 30 to 65 plus 2x20 and 38 (to do 19tpi BSP only) plus a couple more to get you metric. However some lathes used steps of 3 and all sorts of odd ones which are not so elegant. |
David Noble | 03/02/2023 16:48:07 |
![]() 402 forum posts 37 photos | Thanks Bazyle, As you can see there seems to be quite a number needed as I only have 4 or 5. David |
not done it yet | 03/02/2023 18:21:30 |
7517 forum posts 20 photos | Posted by David Noble on 03/02/2023 12:45:22:
Posted by not done it yet on 03/02/2023 12:20:53:
We need some more detail. Most Raglan lathes used 16DP gearing. But they may not be the tooth count required, the correct width (spacers may help), or the bore/boss dimensions - and anything else that may be a limiting factor. Thanks everyone, I was prepared to modify the gears if they were from another make but more details are:- 16D.P. 14.5 deg p.a. 3/8" wide, 3/4" bore, 5/32" keyway. I was hoping to buy these second hand as there are quite a lot that are missing and to buy new is looking quite pricey. David Edited By David Noble on 03/02/2023 12:45:52 Raglan are 5/8” plain bore. |
Martin Connelly | 03/02/2023 19:27:15 |
![]() 2549 forum posts 235 photos | 10mm alloy plate would be better than 8mm to be close to 3/8", you could turn the blanks down to 3/8" if required to be exact. Martin C |
Bazyle | 03/02/2023 20:30:40 |
![]() 6956 forum posts 229 photos | Ah, looks looks you have a 4tpi leadscrew. I suggest you see whether you can modify the banjo or add an outrigger to enable 6 wheel trains. Then use a 2:1 starter pair eg 20 & 40 to make everything more 'standard' so you don't need the high count wheels. |
David George 1 | 03/02/2023 20:41:26 |
![]() 2110 forum posts 565 photos | David I have just made some gears from Acetal and they were easy to machine and seem to be very strong and stable. The machining and gear cutting was so easy compared to cast iron and a lot quieter running.
These are for a tumbler reverse. David |
ega | 03/02/2023 22:07:37 |
2805 forum posts 219 photos | You could also use Oilon (oil-filled nylon) which is self-lubricating. |
bernard towers | 03/02/2023 22:23:43 |
1221 forum posts 161 photos | Acetal is the way to go, machines beautifully with a lovely finish and they run quietly. |
David Noble | 03/02/2023 22:44:09 |
![]() 402 forum posts 37 photos | I hadn’t thought of Nylon/Acetol/Oilon great ideas, thank you. David |
Huub | 04/02/2023 00:12:12 |
220 forum posts 20 photos | You can 3D print these gears, especially the large ones. You probably have to bore or ream the hole for the shaft. It is the metal to metal contact that makes the noise. If you place a plastic gear between 2 metal gears, the gears run really quietly. |
David George 1 | 19/03/2023 22:45:26 |
![]() 2110 forum posts 565 photos | Having run my Acetal gears for over a month and having used them for rough cutting screw cutting and finnish milling they look just as new. I would not worry about having these gears again as long as there is no heat to damage them. They don't evan get warm on my lathe. David |
David Noble | 20/03/2023 08:07:18 |
![]() 402 forum posts 37 photos | Thanks for that David, I've bought a sheet of black acetal and made a 30 tooth and a 75 tooth gear as I wanted to cut a 10 tpi thread.They seem be performing well atm. Many thanks, David |
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