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Eureka form relief tool

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philf:

--- Quote from: Simon0362 on January 25, 2013, 02:55:07 PM ---Very impressive....
Do I understand that you were running the cutter at 60rpm? What feedrate did you use - if you can tell?

Regards,
Simon

--- End quote ---

Hi Simon,

Yes - I used about 60 rpm. I can't tell what the feed rate was as it was done by hand. My guess is only about 10mm/minute. I would have liked to use my CNC so I could have used a known feed rate and my 4th axis but that has a minimum speed of about 166 rpm which is a bit too fast for a carbon steel cutter cutting a silver steel pinion.

I've finshed the turning of the pinion now and have hardened and tempered it. I just need to finish polishing it when I get a new tube of Solvol Autosol tomorrow - I have a nearly full tube somewhere.................

Cheers.

Phil.

raynerd:
Top trumped me there! I was chuffed with my wheel but that pinion is FAB!!!

Boo:
Apologies for the thread resusitation but I thought that it would be better to have my question here rather than start a new thread and have the group end up covering the same ground again.

I was thinking of building a Eureka tool to assist in making gear cutters for small gears for model engines but using a 16mm bore diameter to suite my existing mandrels.  I wondered what the group thinks about thickness of the Ratchet Plate and the Anchor plate ?  Scaling from 12.7mm to 16mm gives something like 10mm and 8mm respectively and I can get gauge plate in both these sizes.  Is gauge plate worth using does the group think ?  I can see that the pawls would also benefit from being made from gauge plate but would any other parts benefit ?

On the subject of gauge plate, I've never used it and don't know what it is like to work with in practice in the annealed state - can anyone tell me how it is to hacksaw, file and machine in general ?  I assume there is no prospect of using a jigsaw on it in these thicknesses and retain any degree of sanity ?

Many thanks,

Boo

awemawson:
Gauge plate (silver steel) in the anealed state is quite nice to work with hand tools, but hardens nicely.

As for the Eureka and scaling it up, I've only used one years ago, and that was made by someone else but I don't suppose dimensions of plate thickness are too critical after all it's not intended to make massive cuts.

Boo:

--- Quote from: awemawson on January 11, 2023, 09:58:35 AM ---Gauge plate (silver steel) in the anealed state is quite nice to work with hand tools, but hardens nicely...

--- End quote ---
Thanks, I suppose an alternative would be to chop it up with an angle grinder, but would there be issues with hard spots doing that do you think ?

Boo

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