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awemawson:
I've had the beds of two Colchester Students, and my present Colchester Master 2500 slideway ground over the years, then had the saddles Turcited and ground, with minimal scraping to finish the job. And I spoilt myself on the current lathe and had all the cosmetic surfaces ground as well. No doubt the purists will howl me down but it seems a much better way of resurfacing a machine if a big enough slideway grinder is available. |
BillTodd:
--- Quote from: awemawson on March 16, 2015, 06:03:43 PM ---Steve, after the welding have you normalised the assembly, heat cycle or whatever. If not is it not going to carry on moving for weeks? --- End quote --- Yes my thoughts exactly. Without heat treating to de-stress the welds you are wasting your time scraping. Even the machining will change the stress pattern and cause the whole job to move. |
Manxmodder:
--- Quote from: awemawson on March 19, 2015, 11:33:37 AM ---I've had the beds of two Colchester Students, and my present Colchester Master 2500 slideway ground over the years, then had the saddles Turcited and ground, with minimal scraping to finish the job. And I spoilt myself on the current lathe and had all the cosmetic surfaces ground as well. No doubt the purists will howl me down but it seems a much better way of resurfacing a machine if a big enough slideway grinder is available. --- End quote --- Andrew, grinding is the only method that can be used on lathes with induction hardened ways. The Harrison models like mine,Mick's and John's all have induction hardened beds,is that thecase with the Colchester Master?....OZ. |
awemawson:
Yes, but I thought that carbide scrapers worked ok on hardened cast iron :scratch: |
vtsteam:
Most of us are wasting our time, Bill, and everything moves. Have you actually built and measured a bolted lathe bed of these dimensions and materials, with these size welds, peened and sequenced this way, so you can actually say what will happen? I haven't, and I'm willing to find out, and doing that isn't a waste of my time. Before you tell me what to do with my time, please mike everyone on this forum's lathes and let me know what you find for an average tolerance. Then let me know when mine will warp past that point so I can switch it off in time. |
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