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Finishing problems

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Darren:

--- Quote from: bogstandard on November 14, 2008, 06:12:55 PM ---That is a bit better than sending them on safari.

--- End quote ---

Why do They do that? Hardly any incentive for the rest of them is it.

Or perhaps it is, pay once, pay twice.....

Darren:
Bought some Gunk (engine cleaner) is a spray can yesterday from the "local" market stall. (and a set of 5 HSS slitting saws, I'm sure they'll come in handy at some point)

So last night I cleaned the 7x12 down a bit. Took the back guard off to get better access at the read bedway and to my surprise there was loads of paint on the underside.
Thinking that this is what I may have been measuring I set about cleaning it off. Some of it was pretty thick too, I had to carve it off carefully in layers. It didn't cover the whole width, but it might have been catching the carriageway along its travel.

Alas no improvement. Now I have better access to that area I can measure it more accurately. I'm getting up to 7thou difference from one end of the bed to the other, with about 3.5thou over the used section of the bed.

Sadly, I think this bed needs some surgery, otherwise I'm flogging a dead horse here.

John if your kind offer is still open we'll have to form a plan .......I'll pm you later if you don't mind

Regards
Darren

bogstandard:
No Problems Darren.

John

rleete:
Darren,

Any resolution on this?  My lathe (Homier 7 x 12) is doing the same thing, and I'm going nuts trying to fix it.  This happens all the time - not just when using the leadscrew, but in all turning work.  I initially thought it was the headstock bearings, but I tightened them up and it didn't help.

Gibs & half nuts have been adjusted over and over.  I improved backlash, and tightened it up a bit, but the "turning marks" are still visible on parts.  It means a lot of extra work finishing parts, and I have to account for more material removal (sanding/polishing) and it's causing me to tear my already thinning hair out!

Anyone?

Darren:
Hi rleete ?

Nothing done as yet I don't believe, but there is no hurry on this as I have another lathe to use. I'm not personally the one being brave with the bed work  :bugeye:
But when the time comes it will be cataloged on these very pages. Should be sometime soon so keep an eye out.

On the head bearings. The standards are plain roller bearings, I changed mine with tapered types when it was nearly new in an attempt to solve this problem thinking it might be the cause.
It wasn't, made no difference to the finish.

I have to agree with you this problem really spoils this otherwise very capable little lathe.

BTW, welcome to the forum, please let us know what you make and interests are. I'm guessing you are in the US?

Darren

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