Gallery, Projects and General > How do I??
Cast iron guide way grinding....
trapper:
Do you have a shaper,doubt if you would need to touch the dovetail be a question of getting right into the corner of where the dovetail starts.I think a mill would be your best bet use a dovetail cutter skim base lick the dovetail up scrape the finish-seen many milling machines tables go on to a planer mill come off looking new-clean top table up skim all burrs out of slots,this done using shaper tooling
MetalMagus:
Pekka,
Instead of grinding the ways could they not be built back up.
See link for Moglice.. Might be an alternative.
http://www.moglice.com/moglice.html
Cheers
Sean
PekkaNF:
I don't think we have that size shapers here. Table is 1000*250*95 mm and while it is not that big, it's still bigger that normal hobby/light industrial machines can handle.
Moglice &al. Seems to be here for a big machine rebuilds, no-one does it small scale and it is expensive here, needs pocketting and all stuff. To fix this machine would exceed the price of newer (still old) one.
For DIY route I would need pristine "mould" to make nonstandard dovetails....project by itself.
Pekka
Jonny:
I would be very very weiry of scraping having seen and heard the shear amount of horror stories of an ex family run precision grinding co.
Never used to fail "Ive only took a couple of thou off" To put right almost certainly 12 thou of every face had to come off.
Unless one of a few highly skilled scrapers in the whole world, leave well alone or treat it as a last resort before scrapping.
Used to be able to scrape pretty well but lost the knack over 35 years ago.
Way out may be to source someone with a big accurate robust mill with power feed and pay them a premium to do it yourself.
Fergus OMore:
I'm hardly in the position to even talk(Thank you). Standing off a bit, might I mention that wear on machine tools is rarely as bad as first imagined. A wear of a scant thous wear will multiply to two thous in machining or worse. A scrape of a thous might restore something that is a rattling old fit.
I once restored a bit of a mangle of a Myford lathe for a friend that was so worn that it was good for bananas but not much else. I t went onto one of these Lumsden grinders( yea, my wife's family were shareholder until they went bust) but a Blancharding might only remove a few thous but you have a sort of decent basis on which to work.
You need references and that solves a lot of hard graft, If yu have something reasonably true, you can scrape to the newly Blanharding surface( a modest few coins) Again, if you go the Devcon or whatever plastic filler route, you do no damage. If you make a mistake, you put on more putty. Whatever you do, you are not doing ANY more damage than where you were.
My lathe bed is slideways ground - but only the bed. This was £200 and the saddle wich was Turcited cost another £50. These were from a small North East firm which restored larger machine tools to as good or better than original.
The above is worth thinking about. Filled plastic is not bodging Try it, please
Regards
Norman
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