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Posted by Martin Whybrow on August 13, 2008, 6:39 pm
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>
>> I've just replaced the topslide feedscrew on my Colchester Bantam
>> topslide and took the opportunity to remove the rather pointless 'metric
>> inch' dial from the handle and replace it with a proper imperial one (the
>> metric one reads up to 254 microns and I get lost after more than one
>> turn). Under the dial, on the periphery of the handle body, there are 3
>> radial holes each containing a spring and a 1/4" ball bearing which act
>> on the inside of the dial to provide friction; I've spent and hour and a
>> half firing ball bearings all around my garage this evening and have come
>> to the conclusion that there's a knack to reassembling this thing and I
>> don't have it. Amazingly, I did find all the balls despite some
>> spectacular ricochets from the garage door and the lathe's chip pan.
>> Evidently, the previous owner of the donor topslide had the same problem
>> as it had been assembled with 3 springs but only 2 balls.
>> Can anyone offer any tips as to how to reassemble this? Also, as I'm in
>> need of one 1/4" ball bearing (possibly more after my next attempt),
>> anyone know of a source?
>> Thanks,
>> Martin
>> --
>> martin<dot here>whybrow<at here>ntlworld<dot here>com
>>
>>
> I don't know the orientation but if you are trying to get a sleeve over
> radial balls you can use heavy grease to hold them in place and use a
> hose-clamp (US term I think) to squeeze them down until the sleeve will go
> on. Kind of like using a piston ring compressor to install pistons in an
> engine. A band squeezed with pliers should work also.
>
> Don Young (USA)
>
Yes, they are radial; unfortunately there's very limited space between the
balls and a the large diameter of the handle itself so a standard hose clip
won't fit.
Martin
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martin<dot here>whybrow<at here>ntlworld<dot here>com
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Posted by Alan in Oz on August 13, 2008, 8:16 pm
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My method of getting the 3 balls into the dial is as follows: 2 pieces
of thin
shim material (steel better than brass) about 1/2 wide, start
the first ball and
sort of cock the inner part of the dial over a bit,
next install the other 2
balls with the shim material holding the balls
down as the outer part is wiggled
to get it to slide over the inner.
Need plenty of patience, a few choice words
to Colchester and a supply
of balls. I did not use grease as this defeats the
purpose of dial
friction. I also rigged up a small curtain to catch sprung
balls, but
after the first one was completed the other 2 dials were easy.
--
Alan in Oz
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Posted by Martin Whybrow on August 14, 2008, 2:46 pm
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>
> My method of getting the 3 balls into the dial is as follows: 2 pieces
> of thin shim material (steel better than brass) about 1/2 wide, start
> the first ball and sort of cock the inner part of the dial over a bit,
> next install the other 2 balls with the shim material holding the balls
> down as the outer part is wiggled to get it to slide over the inner.
> Need plenty of patience, a few choice words to Colchester and a supply
> of balls. I did not use grease as this defeats the purpose of dial
> friction. I also rigged up a small curtain to catch sprung balls, but
> after the first one was completed the other 2 dials were easy.
>
>
> --
> Alan in Oz
> ------------------------------------------------------------------------
> Alan in Oz's Profile: http://www.rcgroups.com/forums/member.php?u=83694
> View this thread: http://www.rcgroups.com/forums/showthread.php?t=908069
>
Thanks, that sounds like a good plan. I have a supply of balls now, the
local bearing supplier to my office was doubtful they'd have them but
sounded surprised when he came back to the phone as they had them in stock.
Martin
--
martin<dot here>whybrow<at here>ntlworld<dot here>com
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Posted by Richard Shute on August 13, 2008, 4:43 am
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>Can anyone offer any tips as to how to reassemble this? Also, as I'm in need
>of one 1/4" ball bearing (possibly more after my next attempt), anyone know
>of a source?
>Thanks,
>Martin
Don's suggestion is pretty favourite, you can also use sticky tape
with the sticky outwards so that it will slide on the hub. Depends on
how stiff the springs are.
There's a guy on fleabay who goes by the inspiring name of 4steelballs
who sells steel (and other) balls funnily enough. If you don't want to
buy 100 I may be able to find one in a tin of recovered balls, keys
and odds & sods. It may not be in perfect condition, but should be OK
for a friction pad. I'll look next time I'm down the shed.
Richard
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Posted by Martin Whybrow on August 16, 2008, 2:47 pm
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> I've just replaced the topslide feedscrew on my Colchester Bantam topslide
> and took the opportunity to remove the rather pointless 'metric inch' dial
> from the handle and replace it with a proper imperial one (the metric one
> reads up to 254 microns and I get lost after more than one turn). Under
> the dial, on the periphery of the handle body, there are 3 radial holes
> each containing a spring and a 1/4" ball bearing which act on the inside
> of the dial to provide friction; I've spent and hour and a half firing
> ball bearings all around my garage this evening and have come to the
> conclusion that there's a knack to reassembling this thing and I don't
> have it. Amazingly, I did find all the balls despite some spectacular
> ricochets from the garage door and the lathe's chip pan. Evidently, the
> previous owner of the donor topslide had the same problem as it had been
> assembled with 3 springs but only 2 balls.
> Can anyone offer any tips as to how to reassemble this? Also, as I'm in
> need of one 1/4" ball bearing (possibly more after my next attempt),
> anyone know of a source?
> Thanks,
> Martin
Well the job's done, I used a narrow tie wrap around the body of the handle
to hold the balls down then pressed the dial on; it took a couple of
attempts and 1 lost ball but I have lots of spares left now.
Thanks to Malcolm, who posted a reply via email rather than on the group,
for the suggestion.
Martin
--
martin<dot here>whybrow<at here>ntlworld<dot here>com
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