Re: [CAD_CAM_EDM_DRO] Another Z Axis question

Hi Christopher:
Helical gears will not help you at all.
You'll still have backlash because the gears need it to function properly.
You'll also have increased friction with helicals vs bevels.
Spiral bevels will not gain you anything either.
You need to come up with a parallel shaft arrangement if you are serious
about eliminating backlash in the drive.
Either direct coupling or timing belt drives will work.
Other arrangements can be made to roughly get you there too, but they are
all Kludges at one level or another.
Cheers

Marcus

----- Original Message -----
From: "Christopher Culbreath" <christopher@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, June 26, 2004 12:11 PM
Subject: [CAD_CAM_EDM_DRO] Another Z Axis question


> In researching, I've notice that a lot of people have mounted their motors
to the outside of
> the mill, where the handle used to be for the Z axis drive. In this
configuration, you're
> dependent on the gears that drive the screw. In my case, these are bevel
gears, and would
> provide an unacceptable amount of backlash (so I'm led to believe) - In
the applications
> where this has been done are helical gears used? Do helical gears provide
distict
> advantages, as far as backlash, over bevel gears? If so, would it be
prudent to attempt to
> retrofit the existing bevel gears, with helical replacements?
>
> Thanks for the info,
>
> Christopher
>
>
>
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