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Model Engineering in UK - Model engineering, metal crafts in UK
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Posted by Austin Shackles on January 23, 2008, 1:53 pm
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OK, I've solved (more or less) the cross-feed, it's now got about 2 thou'
backlash in the middle and pretty much zero at the ends, which is doubtless
down to wear in the screw.
The next thing to receive attention will be the slide ways. It's a more or
less conventional dovetail shape thing, with 2 gib strips in one side of the
slide. They're a bugger to adjust, but the biggest problem seems to be
uneven wear, which means that if you get it tight enough to have more or
less no play in the most-used area (about 1/3 of the way along) it won't
readily get to either end, so you end up with a compromise.
So. Any suggestions for how to skim the mating faces to get them back
parallel? Obviously, there's some adjustment to be had in the gibs, or
indeed they could be replaced; but there's not much point in that unless the
main surfaces are parallel.
The cross-slide comes off easily, the saddle probably not so easy, although
obviously it comes apart somehow, and I don't doubt both need attention.
--
Austin Shackles. www.ddol-las.net my opinions are just that
Travel The Galaxy! Meet Fascinating Life Forms...
------------------------------------------------
>> http://www.schlockmercenary.com/ << ...and Kill them.
a webcartoon by Howard Tayler; I like it, maybe you will too!
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Posted by stereotype on January 23, 2008, 3:59 pm
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It is most likely that the gib strip is worn, as the main cross slide
casting
is probaby worn uniformly so no problem. check the gibs on a
blued surface plate
and scrape them flat ie take the bow out, should
improve things.
--
stereotype
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Posted by Mark Rand on January 23, 2008, 4:04 pm
Please log in for more thread options On Wed, 23 Jan 2008 18:53:36 +0000, Austin Shackles
>
>So. Any suggestions for how to skim the mating faces to get them back
>parallel? Obviously, there's some adjustment to be had in the gibs, or
>indeed they could be replaced; but there's not much point in that unless the
>main surfaces are parallel.
>
Get yourself a copy of:-
Machine tool reconditioning and applications of hand scraping
by Edward F Connelly.
None on amazon.co.uk but a number available on amazon.com.
Read, mark, learn and inwardly digest it.
Then you'll know how.
regards
Mark Rand
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Posted by Charles Ping on January 23, 2008, 5:38 pm
Please log in for more thread options On Wed, 23 Jan 2008 21:04:11 +0000, Mark Rand
>On Wed, 23 Jan 2008 18:53:36 +0000, Austin Shackles
>
>
>>
>>So. Any suggestions for how to skim the mating faces to get them back
>>parallel? Obviously, there's some adjustment to be had in the gibs, or
>>indeed they could be replaced; but there's not much point in that unless the
>>main surfaces are parallel.
>>
>
>Get yourself a copy of:-
>Machine tool reconditioning and applications of hand scraping
>by Edward F Connelly.
>
>None on amazon.co.uk but a number available on amazon.com.
>
>Read, mark, learn and inwardly digest it.
>
>Then you'll know how.
>
>regards
>Mark Rand
I found that book fairly boring and not much use.
Probably just me.
Charles
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Posted by Trevor Jones on January 23, 2008, 9:05 pm
Please log in for more thread options Charles Ping wrote:
> On Wed, 23 Jan 2008 21:04:11 +0000, Mark Rand
>
>
>>On Wed, 23 Jan 2008 18:53:36 +0000, Austin Shackles
>>
>>
>>
>>>So. Any suggestions for how to skim the mating faces to get them back
>>>parallel? Obviously, there's some adjustment to be had in the gibs, or
>>>indeed they could be replaced; but there's not much point in that unless the
>>>main surfaces are parallel.
>>>
>>
>>Get yourself a copy of:-
>>Machine tool reconditioning and applications of hand scraping
>>by Edward F Connelly.
>>
>>None on amazon.co.uk but a number available on amazon.com.
>>
>>Read, mark, learn and inwardly digest it.
>>
>>Then you'll know how.
>>
>>regards
>>Mark Rand
>
>
> I found that book fairly boring and not much use.
> Probably just me.
>
> Charles
Not just you, Charles.
The book is a good, technical, reference material kind of book, that
expects the reader to have a sound understanding of the principles and
the physical act of scraping machine tools, as well as a great deal of
experience already.
It's a really good book to borrow from a public library for a preview,
if you are considering doing any machine tool rebuilding.
There was a gent by the name of Michael Morgan, that put out a book
and video on Scraping, that is a far better investment for someone that
does not have experience or an experienced scraping hand, to fall back
upon. I am certain that the likes of Camden would have similar titles as
well.
http://www.machinerepair.com/video.html
Borrow Machine Tool Reconditioning first. Try to get Fundamentals of
Dimensional Metrology, and Foundations of Mechanical Accuracy on the
loan too. All great books, but of generally less use than their price
would make you believe.
Any companies in your area with a surface grinder that can skim the
surfaces? Some things are better aproached from a mercenary perspective.
The money spent will save an awful lot of time for using it!
Cheers
Trevor Jones
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>So. Any suggestions for how to skim the mating faces to get them back
>parallel? Obviously, there's some adjustment to be had in the gibs, or
>indeed they could be replaced; but there's not much point in that unless the
>main surfaces are parallel.
>