Ok, I'm stumped. Question for Gary (ZAPP)

[Gary]

The simple answer is Yes to all you questions :)
As long as the machining is not something exotic the price will be the same, but bearing in mind most of the machining costs are to do with the fixed end, so if you want machining like the fixed end at both ends i will need to get a quote from the engineering company i use.
If you want a dimension that is in between the 100mm i offer, this is not a problem, infact i do this a lot, you just need to round it up to the nearest 100mm and advise the length, but i will need a proper drawing, with tolerances
Some of the ball nuts come with plastic seals (5mm lead) and the other lead ball nuts come with a rubber seal that is much better.
The reason is that they come from different manufactures.
And fitting the ballnut is not a problem, you would be surprised how many people ask me to do this, and i an thinking of doing this as standard with machined screws.

Hi Gary

While you're on the subject of changing things :D

These here ballscrews you do, can you machine the ends to my pattern rather than just cutting your standard ends? Nothing dramatic, just want to hold the screw in tension rather than leave one end floating...

...and, do they come with seals fitted to prevent ingress?...

...and can I specify a non-standard length?...

...and could you fit the nuts for me if I told you which way round they go? I've never actually had a problem fitting ballnuts, I just find it a bit nerve wracking

Much ta

Robin

[Robin Hewitt]

Sounds promising, I'd probably only need to lengthen the ends a bit, maybe deepen the circlip groove a tadge. A couple of flat spots would be handy.

Can I find the dimensions and details for the double nuts on your website? They seem to be hidden under pre-machined screws, so when you click for info you get told about end machining rather than nuts :confused:

Last time I bought a "zero backlash nut" it was from that other bunch. Turned out I had to crush it sideways. A bit tricky when it's buried under a milling table

[Gary]

THe link to the double ball nuts is here
http://www.slidesandballscrews.com/pdf/35-36.pdf
the ball nuts i have in stock are pre loaded to give a max backlash of 20 micron.
If you want a zero backlash nut, this will need to matched to the ball screw at the factory.

Sounds promising, I'd probably only need to lengthen the ends a bit, maybe deepen the circlip groove a tadge. A couple of flat spots would be handy.

Can I find the dimensions and details for the double nuts on your website? They seem to be hidden under pre-machined screws, so when you click for info you get told about end machining rather than nuts :confused:

Last time I bought a "zero backlash nut" it was from that other bunch. Turned out I had to crush it sideways. A bit tricky when it's buried under a milling table

[Gary]

And the ball nut is the FDU type

THe link to the double ball nuts is here
http://www.slidesandballscrews.com/pdf/35-36.pdf
the ball nuts i have in stock are pre loaded to give a max backlash of 20 micron.
If you want a zero backlash nut, this will need to matched to the ball screw at the factory.

[Robin Hewitt]

The simple answer is Yes to all you questions

Took a while but here it is, can you make 'em?

16mmx5 screws with your anti backlash double nuts.

Threads are your usual M12x1, flats are 1mm deep.

I'd like 12mm ball races to slide on by hand, not tight. Other tolearances are fairly slack, shall we say .25mm

best regards

Robin

[Gary]

Yes we can make them, but to get zero backlash they will need to be made at the factory, and will be a long delivery.
Also how come you dont have a floating end? you have the lower screw fixed at both ends?

Took a while but here it is, can you make 'em?

16mmx5 screws with your anti backlash double nuts.

Threads are your usual M12x1, flats are 1mm deep.

I'd like 12mm ball races to slide on by hand, not tight. Other tolearances are fairly slack, shall we say .25mm

best regards

Robin

[Gary]

Out of interest what are the flats for? Are you fixing the ball screw and turning the nut?
Also 0.25mm is going to be very sloppy on the bearing and may cause you problems?

[Robin Hewitt]

Out of interest what are the flats for? Are you fixing the ball screw and turning the nut?
Also 0.25mm is going to be very sloppy on the bearing and may cause you problems?

The flats are for the grub screws that lock the pulleys and handles in place. The nuts hold tension against belleville washers I wouldn't want to rely on them to grip anything.

The tolerance does not apply to the shaft diameter, that wants to be a nice sliding fit. I'm sure you can do better than .25mm anyway.

[Gary]

Ok good, i will get the drawing made up asap.

The flats are for the grub screws that lock the pulleys and handles in place. The nuts hold tension against belleville washers I wouldn't want to rely on them to grip anything.

The tolerance does not apply to the shaft diameter, that wants to be a nice sliding fit. I'm sure you can do better than .25mm anyway.