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Posted by Alan Bain on April 6, 2008, 11:42 am
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>Hi all.
>
>I've found that with my Cowells dividing head, I need to clamp the
>spindle every time I take a cut to get good results (I'm making clock
>wheels) - there's a nut provided for exactly that purpose. I guess
>this is normal (it's a feature I've seen on other dividing heads and
>tables) - but it's the only dividing head I've ever used, so bear with
>me if I'm totally off with this.
>
>I'm toying with the idea of doing the rotary indexing CNC style (a la
>Division master, for example) but I've noticed that there is no
>mention of spindle clamping in the user instructions or anywhere else
>that I've read.
>
>Is the assumption that spindle clamping should not be necessary, and
>that I'm doing something amiss to need it, or is it just that it's so
>obvious that no-one thinks of mentioning it... ?
If the dividing head is properly adjusted to have minimal backlash
between worm and wheel locking should not be needed for a "light"
job like a clock wheel, but is beneficial for heavier tasks.
In the CNC variety usually you keep current flowing in the stepper motors
to keep a decent holding torque. This means you need to remember to
switch off when finished! The normal permanent magnet holding torque
is insufficient. Again it assumes worm & wheel are well adjusted.
On the other hand I find with my home made head for an 8mm lathe
clamping is necessary, but my workmanship was far from perfect in
this head!
Alan
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>
>I've found that with my Cowells dividing head, I need to clamp the
>spindle every time I take a cut to get good results (I'm making clock
>wheels) - there's a nut provided for exactly that purpose. I guess
>this is normal (it's a feature I've seen on other dividing heads and
>tables) - but it's the only dividing head I've ever used, so bear with
>me if I'm totally off with this.
>
>I'm toying with the idea of doing the rotary indexing CNC style (a la
>Division master, for example) but I've noticed that there is no
>mention of spindle clamping in the user instructions or anywhere else
>that I've read.
>
>Is the assumption that spindle clamping should not be necessary, and
>that I'm doing something amiss to need it, or is it just that it's so
>obvious that no-one thinks of mentioning it... ?