Adrian Keaney | 07/10/2015 15:07:13 |
3 forum posts | Hello everyone. I having difficulty sourcing a reasonable priced set of involute gear cutters no.4,7,8 14 1/2 degree 48DP . Any help on where to look or another alternative would be much appreciated. I had looked at making gear hobs but this is not the road I want to go down. Regards Adrian |
Michael Gilligan | 07/10/2015 16:49:31 |
![]() 23121 forum posts 1360 photos | Adrian, The likelihood of finding commercial cutters at a modest price is remote. You may find this thread of interest. MichaelG. |
David Clark 1 | 07/10/2015 16:52:38 |
![]() 3357 forum posts 112 photos 10 articles | Try RDG on Ebay |
Ajohnw | 07/10/2015 17:21:02 |
3631 forum posts 160 photos | You could get a set of 0.5 mod from here and recalc things as needed the cp is 0.0037" shorter than dp 48 You may need to look on rdg's web site rather than ebay. John - |
John Rudd | 07/10/2015 17:30:50 |
1479 forum posts 1 photos |
RDG only go to 40DP or .75 mod cutters........ However......http://www.ebay.co.uk/itm/Diameter-22mm-8pcs-M0-5-M10-20degree-1-8-Involute-Gear-Cutters-HSS-Module-HOT-/301747511918?var=&hash=item46418da26e Hope this helps.... John |
Michael Gilligan | 07/10/2015 17:43:00 |
![]() 23121 forum posts 1360 photos | I stand happily corrected ... Subject to availbility; those prices look much more affordble than the [cycloidal] horological cutters. MichaelG. . P.S. Adrian does want 14 1/2 deg. Pressure Angle ... so availability may well be a problem. Edited By Michael Gilligan on 07/10/2015 17:46:50 |
Ajohnw | 07/10/2015 17:56:01 |
3631 forum posts 160 photos | You could also make your own. Michael posted a link that leads to links to the sums. There are several ways of making cutters with relief about on the web so that they can be resharpened. Much depends on what you are cutting really. Hardened and tempered silver steel or gauge plate isn't too bad on brass or even mild steel. John - |
ian j | 07/10/2015 20:42:19 |
![]() 337 forum posts 371 photos | Adrian. I've just had the same quest for gear cutters no.2 & 3 14 1/2 degree 48DP .. I tried Tracy tools with no luck but they suggested "Home and Workshop Machinery" of Sidcup who had them pre used at £15 each + VAT & postage.. Ian |
John Rudd | 07/10/2015 21:56:47 |
1479 forum posts 1 photos | Posted by Michael Gilligan on 07/10/2015 17:43:00:
I stand happily corrected ..
P.S. Adrian does want 14 1/2 deg. Pressure Angle ... so availability may well be a problem. Edited By Michael Gilligan on 07/10/2015 17:46:50 Oops, sorry Michael,I missed the pa criteria...my apology to you.. |
Ady1 | 08/10/2015 02:11:33 |
![]() 6137 forum posts 893 photos | To get the DP, just add 2 to the tooth count and divide by the outside diameter
42/x=48 x=42/48 x=0.875 inch for 40 teeth Is this for a watch or something? |
Michael Gilligan | 08/10/2015 07:14:30 |
![]() 23121 forum posts 1360 photos | Posted by Ady1 on 08/10/2015 02:11:33:
... x=0.875 inch for 40 teeth Is this for a watch or something? . Probably an "or something" 48 DP is a fairly common size on small-ish mechanisms. MichaelG. |
Adrian Keaney | 08/10/2015 12:42:13 |
3 forum posts | Thanks for all the help, I got in touch with Home and Workshop Machinery and they have two cutters at a very reasonable price. The cutters are for the Tiny Inline 4 engine Once again thanks for all the replies everyone. Regards Adrian |
Roderick Jenkins | 08/10/2015 13:01:48 |
![]() 2376 forum posts 800 photos | Adrian, I'm glad you managed to get what you were after. In general, if you are making all the gears then it will not matter if they are 14.5 degrees or 20 degrees PA provided they are all the same. 14.5 is effectively an old standard and it is only important to match them if you are making a gear to fit with existing ones: change gears for British lathes are a common need. 20 degree PA gear cutters are more readily available and it opens up the opportunity to find a near equivalent in metric Mod sizes which are usually much cheaper. Rod |
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