Re: [CAD_CAM_EDM_DRO] Bridport Z axis knee how to

Wally,

I think someone mentioned that there is no backlash because of the
weight of the knee and all it supports. The knee, saddle, and table add
up to around 650 pounds, plus whatever workholding equipment (85 pounds
for a 6" vise, 130 for a 15" rotary table, etc.), plus the workpiece
itself. It's *always* going to be pushing down on the screw.

I know some people have used gas springs to reduce the effective weight,
but it's still all going in one direction.

- Steve

cnc_4_me wrote:

>I have read many messages of happy campers that have used the knee on
>a bridgport for the Z axis...What was never mentioned in these posts
>is how they have gotten rid of the backlash from the bevel gear drive
>(assuming it was used???)...Or if a whole new drive scheme was
>invented...
>
>Inquiring minds want to know!!!
>
>
>Wally
>