Orac assembly starts
Before reinstalling the carriage it is a good idea to check that lower surfaces of the bed are smooth. Usually the carriage moves in limited area near chuck and that area gets polished and other areas may accumulate dirt. I polished bed underside with oil and very fine steel wool.
This is how underside of the Orac Carriage looks like. It has been thoroughly cleaned and is ready to be installed.
Plates which lock the carriage to the bed from underside are very accurate. No shimming plates are used, fit is very accurate. If you detach the carriage as I did please handle the carriage carefully and maintain the original position of the plates.
At the picture below the carriage and the ballscrew.
Orac X-ballscrew has double ballnuts and backlash is removed by rotating one of the ballnuts against spring loading washers. Metal piece between the ballnuts connects the ballscrew to the carriage. I decided to oil the ballscrews with synthetic vaseline.
Thick mounting plate is placed between ballscrew assembly and carriage. Mounting plate adjusts the hight of the ballscrew to be correct for ballscrew end supports . Again no shimming plates, very nice build quality from Denford.
I let the ballscrew be slightly loose becouse I will have to mount end supports first before tightening the ballscrew assembly to the carriage.
To be continued...
Cheers!
Julius