Re: [CAD_CAM_EDM_DRO] Re: Z Axis drawings posted

Wally, it looks to me like the drawing file shows the motor and the ball
screw REALLY are 90 degrees apart. The shaft uses a bevel gear on both
ends.

Smoke
-----Original Message-----
From: Wally K <cnc4me@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Tuesday, November 28, 2000 2:39 PM
Subject: [CAD_CAM_EDM_DRO] Re: Z Axis drawings posted

>Thank you for posting pictures of Z axis. I looked them over and am
>still confused. In one pic you show a stepper mounted on the knee.
>In another pic of inside of knee you show the drive belt going to the
>ballscrew. It seems to me the planes of the sprockets on motor and
>ballscrew do not line up. It looks to me like they are 90 deg. apart.
>
>
>Wally K.
>
>P.S. why does the sprocket assembly inside the knee have a graduated
>dial on it.
>
>
>
>
>--- In CAD_CAM_EDM_DRO@egroups.com, John Stevenson <machines@n...>
>wrote:
>> I have posted some pictures and drawings in a folder called Z Axis
>screw in
>> the files section.
>> These are of two machines that I have. As you can se from the two Z
>axis
>> screw pictures both ballnut blocks fasten to the quill by two allan
>cap
>> bolts.
>> I have also included the drawings from the parts list of the Acton
>machine
>> on the Z axis layout in case this helps anybody.
>> On the Acton machine it also has a stepper controlled knee
>designated the W
>> axis as well as the spindle designated Z axis.
>> This operates the knee via a bevel gearbox on top of the knee
>ballscrew.
>> The residual magnetism of the stepper motor, a 1200 oz unit, is
>sufficient
>> to stop it creeping down under it's own weight. When switched off or
>> de-energised the knee has to be locked off to prevent it going down
>on it's
>> own.
>> The weight of the knee is sufficient to eliminate any backlash in
>the gears
>> etc.
>> A picture and drawing show the layout of this axis.
>> --
>>
>> Regards,
>> John Stevenson
>> Nottingham, England
>
>
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