indexing head lathe

[Danni BurnsParticipant @danniburns84841]

Thanks bear. I guess I need to include ‘model-emgineer’ in the search queries.

I’ll try that.

[Danni BurnsParticipant @danniburns84841]

I’ll try that again. Posting from my phone was messy.

 

Thanks Jim. And I appreciate the pic. Id be lost without it.

I did wonder what the purpose of the pins was on some gears (synchronisation). I chose one with a key.

Great idea with the index/bolt. Looks like you could make/modify that further to incorporate a spring (and possibly make more than 1) to save all that winding in.

Cheers

[Howard LewisParticipant @howardlewis46836]

Danni,

A gear intended for a Myford 7 Series (With a key way) can be used on other lathes, using a pin to compound with another gear. The Myford ML1,2, 3, and 4 use 3/32″ pins in drillings (Halfway through the gear, so that the pin does not fall out) for this purpose.

I’ve done it, to use a ML7 60T on a ML4.

I like the ideas of using male and female detents to give a half tooth advance. (3 degrees with a 60T)

Howard

[Danni BurnsParticipant @danniburns84841]

Hi Howard

Thanks for the info.

Yeh I do too (re. male and female detents). Im a little concerned about how much steel will need to be removed to miss the next teeth (as the gears are so small), but let’s see if possible.

cheers

[Howard Lewis]

On Howard Lewis Said:

[…] I like the ideas of using male and female detents to give a half tooth advance. […]

Workshop Practice #37 ‘Dividing’ illustrates the concept quite well

MichaelG.

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[BazyleParticipant @bazyle]

The normal method of getting the male/female detent is just to stark with a wedge or ‘screwdriver blade’ that fits into the gap between teeth and then file a V notch across it that fits over a tooth. Make a spring loaded detent that rotates and it is child’s play to double the number of locations.
edit : MG posted quicker than me.

If looking for gears with pins don’t forget that Drummond lathes use larger 14 DP changewheels with larger pins that are totally incompatible with the Randa and Myford ones but might look similar on an ebay photo.

[Danni BurnsParticipant @danniburns84841]

Thanks MG and Bazyle

I think that is what I was expecting to have to do, my concern was as shown in S4 above. Not much meat left on that.

approx 5.4mm then the female removed.

cheers

 

[Danni BurnsParticipant @danniburns84841]

I wonder does anyone know what gear cutter (size, etc.) would be required to cut this for ML7 60T Gear?

Cheers

[BazyleParticipant @bazyle]

Don’t worry there is a special tool specifically designed for this job – called a triangular file. The job requires almost no precision.
Also unless you were thinking of making it out of chocolate it will be plenty strong enough. Edit : and brass or aluminium will be easier to work than the steel mentioned on the drawing.

Don’t overthink it.

[Danni BurnsParticipant @danniburns84841]

Ha. Thanks, Bazlye. Good point.

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