Re: [CAD_CAM_EDM_DRO] Re: Driving a Bridgeport Knee

Just a thought. Have you considered modifying the pedestal mount for
the nut. This is the casting that bolts to the base of the mill and
holds the Z axis nut. You could mount the nut in a large ball bearing
had have the axis drive motor rotate the nut. You would have to
lock the lead screw with a clamp of some sort. This would allow
you to continue to use the crank if you released the clamp and would
put the axis drive motor out of the way.

Pete.

----- Original Message -----
From: "Polaraligned" <polaraligned@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, February 14, 2005 6:25 AM
Subject: [CAD_CAM_EDM_DRO] Re: Driving a Bridgeport Knee


>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers <rogersmach@y...> wrote:
>> Sounds like a good idea. Take the bevel gears out of the mix. That
> would be a major undertaking though. belting a servo to the input
> shaft is pretty easy to do and the servo is still out of the way. I
> can't imagine why anyone would want to raise the knee by hand. I have
> no handcranks at all on my machine.
>>
>> Ron
>>
>
>
> I really want the handcranks for the "quickie" machine job, or
> just incase. The little effort to cut a rectangular slot and
> machine the leadscrew a bit further down to accept the pulley,
> seems like a minor amount of work compared to the ease of mounting
> the motor and getting it out of the way.
>
> Scott
>
>
>
>
>
>
>> Polaraligned <polaraligned@o...> wrote:
>>
>>
>> I am thinking about driving the knee with a pulley just below the
>> bearing on the Z-axis leadscrew. I would machine the leadscrew down
>> to accept the pulley. The motor would be mounted on the side of the
>> knee, and to get the timing belt out I would cut a rectangular slot in
>> the side of the knee.
>>
>> Advantages:
>> Motor is out of the way.
>> I can still use the handle to move the knee via the bevel gears.
>> (can't leave the handle permanantly attached!)
>>
>> Disadvantages:
>> Lose about 2 inches off the bottom of the knee travel
>> Changing belts would be a real pain in the you know what.
>> Permanantly alter the knee with hole (which does not bother me)
>>
>>
>> I think the motor will have no problem with clearances.
>> Does this sound good? or am I missing something.
>>
>> Scott
>>
>>
>>
>>
>>
>>
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> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
> sister site to the CCED group, as many of the same members are there, for
> OT subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
> DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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