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Myford Change Wheels

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not done it yet01/02/2019 20:05:12
7517 forum posts
20 photos
Posted by Roderick Jenkins on 31/01/2019 21:02:40:

Pretty much anything will be probably outlast us but I chose FC steel for these " Myford" gears ( actually for the GHT bending rolls). They cut pretty easily with 2 passes of an RGD cutter.

rolls gears.jpg

Rod

‘They”. Do you mean you cut them all separately? Or was it one long cut and then parted off?

Roderick Jenkins01/02/2019 20:38:34
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2376 forum posts
800 photos
Posted by not done it yet on 01/02/2019 20:05:12:
Do you mean you cut them all separately? Or was it one long cut and then parted off?

rolls milling.jpg

smiley

Rod

Howard Lewis01/02/2019 22:24:18
7227 forum posts
21 photos

The same method as I used for my Bending Rolls.

You just chamfer the edges before finally parting off, and then make a collet to hold each gear while the faces are cleaned up, if they are not smooth enough.

Howard

not done it yet01/02/2019 23:57:11
7517 forum posts
20 photos

Thanks for the pic, Rod.

I would have probably fitted 4 blanks on an arbor, to cut them.

Andrew Johnston02/02/2019 09:12:26
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7061 forum posts
719 photos
Posted by SillyOldDuffer on 01/02/2019 18:54:26:

Provided the machine has enough grunt and the tool can take the strain, using the maximum amount of edge possible per cut will extend the life of the tool. This is important in industry, but even something the size of Bridgeport has limits, which is why hefty horizontal mills are popular.

A Bridgeport is versatile, you might even say flexible; but sadly in more than one sense. The tool will certainly take the strain. I understand that for smaller (larger?) DP values such as 2DP, or less, roughing cutters were available. But at that size you're talking tooth depths greater than one inch, so large by modelling standards.

Plus one on horizontal mills, never managed to even make the motor cough on mine, whereas I have stalled the Bridgeport a few times. embarrassed Here's a 5DP gear in cast iron being cut, in one pass, with a secondhand cutter from the US via Fleabay:

final drive gear cutting.jpg

Total cost of the machinery in this picture was less than £500, including delivery of the mill, so no need to splash out if you've got the space for a horizontal.

Andrew

Edited By Andrew Johnston on 02/02/2019 09:12:59

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