48 dp involute gear cutters

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48 dp involute gear cutters

This topic has 13 replies, 8 voices, and was last updated 8 October 2015 at 13:01 by Roderick Jenkins.

Viewing 14 posts - 1 through 14 (of 14 total)

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7 October 2015 at 15:07 #206957
Adrian Keaney
Participant
@adriankeaney12991
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
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7 October 2015 at 15:07 #32578
Adrian Keaney
Participant
@adriankeaney12991
7 October 2015 at 16:49 #206974
Michael Gilligan
Participant
@michaelgilligan61133
Adrian,

The likelihood of finding commercial cutters at a modest price is remote.

You may find this thread of interest.

MichaelG.
7 October 2015 at 16:52 #206975
David Clark 13
Participant
@davidclark13
Try RDG on Ebay
7 October 2015 at 17:21 #206980
Ajohnw
Participant
@ajohnw51620
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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7 October 2015 at 17:30 #206984
John Rudd
Participant
@johnrudd16576
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
7 October 2015 at 17:43 #206986
Michael Gilligan
Participant
@michaelgilligan61133
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
7 October 2015 at 17:56 #206988
Ajohnw
Participant
@ajohnw51620
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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7 October 2015 at 20:42 #207003
ianj
Participant
@ians
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
7 October 2015 at 21:56 #207009
John Rudd
Participant
@johnrudd16576
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..
8 October 2015 at 02:11 #207020
Ady1
Participant
@ady1
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?
8 October 2015 at 07:14 #207025
Michael Gilligan
Participant
@michaelgilligan61133
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.
8 October 2015 at 12:42 #207066
Adrian Keaney
Participant
@adriankeaney12991
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
8 October 2015 at 13:01 #207072
Roderick Jenkins
Participant
@roderickjenkins93242
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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