cutting gears (myfords)

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Andrew Bishop - 06 Dec 2006 21:47 GMT

I need to cut quite a few gears of 1.25 module now I understand that myford
7 gears are 20 dp which = 1.27 module would I be able to hob these down to
1.25 using a 1.25 hob and the gear on a free running spindle

hob on a vertical mill with head off set by hob pitch angle
gear on a free running spindle

I think myfords pressure angle is 14.5 and I will be cutting a pressure
angle of 20

buying the myford gears is as cheep almost as buying blanks in cast-iron

your thoughts would be a help

Thanks Andrew

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Andrew Mawson - 06 Dec 2006 22:39 GMT

> I need to cut quite a few gears of 1.25 module now I understand that myford
> 7 gears are 20 dp which = 1.27 module would I be able to hob these down to
[quoted text clipped - 11 lines]
>
> Thanks Andrew

Well Andrew, when I was hobbing change gears for my Mikron, I quite
sucessfully meshed Myford change wheels and Mikron gears on my
machine - they obviously should not be used together, but for the
short period and light loads involved I had no problems. Incidentally
I got an aquaintance to flame cut my blanks from mild steel plate,
which I then bored and skimmed to size in the lathe.

AWEM

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Andrew Bishop - 06 Dec 2006 22:53 GMT

>> I need to cut quite a few gears of 1.25 module now I understand
> that myford
[quoted text clipped - 24 lines]
>
> AWEM

good idea I could then sell the myford gears on again

Thanks Andrew

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Tim Leech - 07 Dec 2006 07:47 GMT

>> I need to cut quite a few gears of 1.25 module now I understand
>that myford
[quoted text clipped - 20 lines]
>machine - they obviously should not be used together, but for the
>short period and light loads involved I had no problems.

I've done the same. Some I've used the Myford gear to make a 'proper'
changewheel, others I've just kept the Myford gear in the stack. If a
job came up which needed a number of gears I would probably make a new
one, but I'm happy to use them 'as is' for very occasional jobs.

> Incidentally
>I got an aquaintance to flame cut my blanks from mild steel plate,
>which I then bored and skimmed to size in the lathe.

I've generally made mine from slices of round bar, cast iron or steel.
Nylon should be fine, too. As Andrew (one of them) said, the gears are
not heavily loaded.

To Mark:- I really will try to get that pic sorted out today!

Cheers
Tim

Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service

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Model Forum / General / Models / December 2006

cutting gears (myfords)