#DRUMMOND LATHE RESTORATION SERIAL NUMBER#

And the screw's endfloat in the brass bearing/mount is about 0. I can move the nut back and forth about 1.0mm on the screw. RDG do a 3/8 x 10tpi LH tap for ВЈ10 but not an 8tpi :sad:, then again i dont want to be making a new screw if I can help it. It is 8tpi LH x 3/8', I measured it accurately with the digital calipers. this is the topslide, but the cross-slide also has a screw head only visible once the topslide is removed.

Further inspection revealed a bronze/brass nut held in by a screw - see pics. Where the RelMac has the leadscrews working directly into the cast iron, the SuerRelm is more sophisticated and I found, after moving the tool carrier and cleaning 85 years of gunk off, a screw head. OK, a closer inspection and the application of some cleaning cloths showed I was wrong in assuming the SuperRelm was like its smaller brother. I think the advantage of the second approach is I can trial different nuts and maybe get some form of anti-backlash approach in there. mill out a section of the block and drop in a new 'nut'.bore out the cast iron block (with my new boring head on the mill), assuming there is space and fit a bronze/delrin/whatever sleeve.

#DRUMMOND LATHE RESTORATION SERIAL NUMBER#

You should be able to date your machine from the serial number on the right hand end of the rear bed shear/way and look it up on .uk site. fit new metric trapezoidal screws, say TR10x2 Myford took over manufacture from Drummond in WW2, fitting V-belt pulleys in the process.A very careful and sympathetic restoration was carried out with the aim of preserving the original paint and with just cleaning and polishing as. I'll get some pics/drawings done in due course but I'm guessing the wear is in the cast-iron block (nut) and not the screw as I can move the slide back and forth 2mm on the screw. With the lathe came the original tender documents, correspondence with the War Office Disposals Department, Drummond Brothers and the tool suppliers Brooke Tool Manufacturing Co. In other words there is little opportunity to make another part. It currently has 8tpi ACME (or something like that, square topped) threaded screws working onto a tapped cast-iron block which is the slide itself. I need to fix the backlash on the cross- and top-slide on the lathe (the 85y old one)

This is one for the experts, JohnS, Robin, etc.

Drummond lathe restoration