Gooey rollers again.

[Allison]

>
>Subject: Re: Gooey rollers again.
>   From: ard at p850ug1.demon.co.uk (Tony Duell)
>   Date: Wed, 29 Aug 2007 23:15:58 +0100 (BST)
>     To: cctalk at classiccmp.org
>
>> >and not end up the size or shape you expect.
>> 
>> Actually is fairly easy once you know how.  You need a lathe and a rotary 
>> grinder with the right wheel (correct abrasive).  Rather than using the 
>
>What you're describing is known as a 'toolpost grinder' over here. It's a 
>fairly standard (if expensive) lathe add-on.

My description was for the non-machinist amoung us.

>
>> usual tool (cutting edge) you apply the grinder mounted on the cross peice
>> so than you abrade away the urethane, silicone rubber or whatever flexible 
>> material is used.  The process is slow but with care you get excellent 
>> results.  Learned than from a machinest that was really good.
>
>It works very well (and it's usef for getting very accurate results on 
>metal too, you can take a much finer cut with a toolpost grinder than you 
>can with a normal lathe tool). 

Yep, I used to use that for post finishing oil hardend stainless 
steel parts. Heat can distort parts so some post finishing is needed
for precision work.

>Apart from the cost, the other disadvantage is that abrasive dust goes 
>everyway, including into the 'ways' of the lathe. If you don't clean it 
>out very carefully, you will do a lot of damage.

If the roller (machined part) is rubber it can make a mess as well.
When doing metals coolent was always used and that tended to wash 
abrasives down but rubber tended to clog the pumps and tubes.  Major
cleanup job.  I used to get the opportunity to use the big Monarch 
lathe for that job as the head machinist knew if I wanted to use the 
vertical mill or anything for my projects I'd clean it to his 
specifications without complaint before and after.  I rigged a 
vacuum setup to pick up the waste for him that worked well.  Fair 
trade in my mind!


Allison