Top slide alternative

[olderdan]

Nothing new about this idea but here is my version made from 1/2inch M/S plate and a square block.
The method of standard topslide clamping by side screws has often been criticised for spreading the crosslide and affecting gib adjustment, this makes use of T slots assuming you have them and has no side effects of that nature, it can also be used as a rear toolpost.
If made to the same height your topslide, your tool holder settings remain the same.
The need for this was brought about while turning a solid pillar drill column to replace the flimsy tubular one supplied, I was having trouble maintaining consistency over 36 inches on a 2 inch dia.
I have experienced improved performance and finish and also parting off by eliminating three possible movement faces (base, slide and feed nut) and as a bonus it does not clash with the tailstock. I now only use the topslide for taper turning,
I finally managed to obtain a good finish and parallel within .001 in a pre-toughened cast steel called O8S, an odd choice perhaps but I had some in stock.