Acetal / Delrin cross slide lead screw nut.

Splat said:
Here's another one.
Click to expand...

Thanks Splat, hadn't seen that one.

I have some 3/4" Acetate rod that I could have used to do a similar job as shown there, but with my worn nut I thought would have had trouble milling the housing part, also there is not much room for one in the Atlas carriage.

The more I think about it, I reckon a stepped spigot (so that the original type screw head could be used) and corresponding modified hole in the cross slide would be a worthwhile improvement for long term strength, summat like this. .

nut 1.JPG

I will be trying this when i make the one for my turret slide..

Bernard

nut 1.JPG
 
I was going to say that I know Delrin/Acetal is used for gears and bushings, pulleys, and many other uses so I would imagine it's quite impervious to oils. BTW, thanks for the link Bernard.
 
Well if it stands up to the pounding it may just be a great thing keep us informed about how fast it wears in and how many hours before you get back lash.. Ray
 
Ray, I just remembered when I worked on construction machinery in the around 1972, we had 360 excavators and dozers working on tidal sea defence work, their bottom track rollers were supported by sealed roller/ball bearings that lasted no time at all. When they broke up the roller and pin was usually wrecked too, causing way to much down time, the tides determined the overtime we worked.

One day a chap came into the workshop with some large black plastic tubes and plain steel pins, which he wanted us to try out in the track rollers. How we laughed!:rofl:

Guess what? they lasted ages and ages, Can't remember if the pins where stainless or not, but the plastic never showed any noticeable wear and the pins wore instead, only the pins were replaced, and not till over half their thickness had gone. If grit did get embedded in the plastic it didn't show.

I left that job (loved the work, but rubbish hours/money) so don't know the outcome, but I now reckon that was Acetal/Delrin .

Bernard
 
Dranreb said:
Ray, I just remembered when I worked on construction machinery in the around 1972, we had 360 excavators and dozers working on tidal sea defence work, their bottom track rollers were supported by sealed roller/ball bearings that lasted no time at all. When they broke up the roller and pin was usually wrecked too, causing way to much down time, the tides determined the overtime we worked.

One day a chap came into the workshop with some large black plastic tubes and plain steel pins, which he wanted us to try out in the track rollers. How we laughed!:rofl:

Guess what? they lasted ages and ages, Can't remember if the pins where stainless or not, but the plastic never showed any noticeable wear and the pins wore instead, only the pins were replaced, and not till over half their thickness had gone. If grit did get embedded in the plastic it didn't show.

I left that job (loved the work, but rubbish hours/money) so don't know the outcome, but I now reckon that was Acetal/Delrin .

Bernard
Click to expand...

I have seen that too in constuction equipment we use to make bushings out of nylon or teflon the pins would wear out before the plastic most of the time it was because the plastic would hold in the grit and sand it would become imbedded in the plastic and would basically grind the steel shaft down.. Ray
 
iron man said:
I have seen that too in constuction equipment we use to make bushings out of nylon or teflon the pins would wear out before the plastic most of the time it was because the plastic would hold in the grit and sand it would become imbedded in the plastic and would basically grind the steel shaft down.. Ray
Click to expand...

Reckon you're right Ray, I'll be keeping an eye on those pesky chips!

Bernard
 
Looks like I better order some material and try it.

Good Idea!
 
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