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48 dp involute gear cutters

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Adrian Keaney07/10/2015 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 Gilligan07/10/2015 16:49:31
avatar
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 107/10/2015 16:52:38
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3357 forum posts
112 photos
10 articles

Try RDG on Ebay

Ajohnw07/10/2015 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

**LINK**

You may need to look on rdg's web site rather than ebay.

John

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John Rudd07/10/2015 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 Gilligan07/10/2015 17:43:00
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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

Ajohnw07/10/2015 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

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ian j07/10/2015 20:42:19
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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 Rudd07/10/2015 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..

Ady108/10/2015 02:11:33
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6137 forum posts
893 photos

To get the DP, just add 2 to the tooth count and divide by the outside diameter
of the gear. So, 42 divided by 3.49 is 12.


So we have a 40 tooth gear=42

42/x=48

x=42/48

x=0.875 inch for 40 teeth

Is this for a watch or something?

Michael Gilligan08/10/2015 07:14:30
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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 Keaney08/10/2015 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 Jenkins08/10/2015 13:01:48
avatar
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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