Mounting chuck directly to rotary table.

[old martParticipant @oldmart]

I saw an advert from RDG on ebay for a tilting 100mm rotary table with a three jaw scroll chuck. It was reduced in price because of backlash in the worm drive, and not having the mounting plate for the chuck. The table has three slots and the HBM chuck had three rear mounting threads. I drilled through the rear mounting holes after ascertaining that they were in the optimum position for converting to front mount. I drilled 6.2mm through the 8mm threads and then used a counterbore 6mm deep from the front for SHCS to fit just underflush. Three teenuts were made with 6mm threads in them and the chuck fits a treat. The original 8mm rear mounting threads were not touched by the modification. The tee slots in the table were not big enough for 8mm threads hence changing to 6mm. As for the backlash, it is only 3.2 divisions, I probably won’t bother to correct it. Mike and I will be discussing ways of stiffening the locking of the tilt mechanism, possibly with something at the other end of the hinge. The little 4 jaw independent Crown chuck will have to have an intermediate plate made up next week and use the inner mounting holesand with the tee nuts reversed in their slots.

[HuubParticipant @huub]

As for the backlash, it is only 3.2 divisions, I probably won’t bother to correct it.

Normally, these HBM rotary tables have a grub screw to adjust the worm backlash.

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