Flat lap for rock polishing

These parts will assemble a working flat lap for rock polishing. The assembled parts drop onto a standard 5 gallon bucket to hold the drip water. It uses inexpensive 6” or 8” diamond disks and is driven by a 12 volt DC motor, all of which can be purchased from Amazon. It is assembled with eight 3-1/4” stainless steel machine screws and nuts.

The longest part is 10” which will have to fit diagonally on your bed.

The slots in the side supports were made to fit a bucket rim that measures 11-1/8” ID and 11-3/4” OD.

One critical part is the disk support that fits on the motor shaft. This has to be a snug fit to prevent wobble. The motor shaft is 8mm, which is just about 5/16". But the exact size of a printed hole is uncertain and may depend on the material you print with. I used carbon infused PLA which tends to make a smaller hole. The same part printed in straight PLA is likely to be looser. So your first print should maybe be this part and fit it to your motor to verify you can