Member postings for Emgee

Hi Dave, you may want to consider using a small DC motor on the table X axis, many are low cost and run at 12 Volts so quite safe to use, could be direct or gear/belt/pulley connection to your existing feedscrew, just a case of sizing for the power required and figuring out the connection method. 12 VDC controllers are plentiful and very low cost. You would of course need to attend the machine to reverse the travel at each pass, although this could be achieved by using limits connected to reverse direction at each hit.

Going the stepper route would I believe allow better control but at higher cost.

Rgds, Emgee

Not certain but possibly the fees on ebay UK are higher than in other countries, they do like clobbering the Brits.

Emgee

Nice work and useful bit of kit. For more fixings to the table I can recommend drilling/tapping holes in place of cutting more tee slots, just add them as required, it is all too easy to overtighten in a tee slot and hey presto a broken table.

Emgee

Hi Richard

I like your site and thanks for allowing me to download some useful programs.

Emgee

Trying to paste a sketch into the reply, no success.

Need to find a Cmd key on the keyboard !!!

Emgee

Edited By Emgee on 24/10/2013 19:47:46

Hi Frank

If you are using the grinder handheld be sure to wear the full range of safety equipment, even then it could be a dangerous for health operation.

Better to use a thicker disc, make sure it's a cutting disc and not just a grinding disc.

Emgee

After dismantling, cleaning and re-assembly check for run-out after using only 1 of the 3 chuck tightening points, check all 3 separately and you will most likely find one gives consistently better results than the other 2.

Emgee

Suggest you fit a tenon on the base to engage your table Tee slot, this will provide extra rigidity with the holding down accomplished as suggested by JasonB, and be quick to set up when needed without "clocking."

Emgee

Peter's idea of wedges is great, also you may be able to locate a collet chuck with a self ejecting collar, they were made by Clarkson and had an external threaded ring at the back of the chuck that when rotated applied pressure to the spindle end/column so forcing the chuck from the spindle. I did use Mr Thor's copper end on the 3/8" drawbar to remove MT3 tooling from a Victoria mill for many years, I didn't notice any bearing damage but agree that could be a problem.

Emgee

Hi Oliver

Do you need to harden the shaft because of an integral crankpin ?

Current Pylon racing 6.5cc engines have pressed in crankpins and run at 32k in air, using this method

may save you nitriding as the material choice is very tough.

Rgds, Emgee