nook ballnuts

[lagfish]

For those of you who have converted to CNC using the nook ballnuts from homeshopcnc, can someone sell me their 15/16" (0.9375) 16TPI tap for screwing in the ballnuts? I don't have much experience with internal thread cutting on a lathe so I don't want to waste time on it. Thanks

[Runner4404spd]

wholesale tool carries it, if you want to buy it new. they aren't that expensive. i don't want to give mine up but i'll tap your parts for you if you want to send me the peices.

[ger21]

Ebay

http://tinyurl.com/2nf2kd
http://tinyurl.com/2jfplp

[ataxy]

the new nut they carry at homeshopcnc a pretty expensive compared to the one they had before i was checking with them the other day to get two one for the x and one for the y here is the price i got from them

Screw stock: $1.89/in
Ballnut: $95/ea
Fixed end support: $120/ea
Free end support: $55/ea
Standard end machining for fixed end: $85
End machining for free end: $25

so if you want double ballnut your allready at 400$ just for the nut

[fatal-exception]

Check e-bay. I got mine for about 20 bucks delivered. Take the delivery time to figure out how to tap that big hole square in all directions and on center.

Paul

[acondit]

Originally Posted by ataxy the new nut they carry at homeshopcnc a pretty expensive compared to the one they had before i was checking with them the other day to get two one for the x and one for the y here is the price i got from them Screw stock: $1.89/in Ballnut: $95/ea Fixed end support: $120/ea Free end support: $55/ea Standard end machining for fixed end: $85 End machining for free end: $25 so if you want double ballnut your allready at 400$ just for the nut

Ataxy,

The specs on the new line looks like metric 1605. Do you know if that is correct?

Also he has the accuracy as 0.0018"/inch, that would be 0.021"/foot? Is that right or is it supposed to be 0.0018"/foot?

Alan

[ataxy]

Originally Posted by acondit Ataxy, The specs on the new line looks like metric 1605. Do you know if that is correct? Also he has the accuracy as 0.0018"/inch, that would be 0.021"/foot? Is that right or is it supposed to be 0.0018"/foot? Alan

yep there metric humm it must be 0.0018 or else accuracy would be pretty bad

[lagfish]

hmm, didn't realize how cheap it is. I will just buy it. Thanks for the offer though, Runner4404spd.

[DonF]

Originally Posted by fatal-exception Check e-bay. I got mine for about 20 bucks delivered. Take the delivery time to figure out how to tap that big hole square in all directions and on center. Paul

I'm no expert on a lathe but another site had a new person with a lathe recommending cutting 1/2 depth threads on the lathe. Then finishing with a tap... That method gave him good results or so the post said.

I know most experienced lathe people cut threads with no tap to chase the threads. I figure I will practice on scrap until I get the results I want.

[lagfish]

I was just going to hold the tap on the tailstock, but I now that I think about it, the tailstock is probably not dead on center. Half tapping the threads on the lathe sounds like a good idea, since the hardest and most time consuming part is finishing the threads because you have to go a few thou at a time for the last bit and try to fit your part in after each pass.

On the Y-axis of the x3, a small missallignment isn't a big deal since the ballscrew is supported only at one end. But a missalignment in the X or Z might cause the ballnut to seize near the ends of its travel when the room for deflection of the ballscrew is small and also cause premature wear on the balls.

[Neil_J]

I have three flange nuts for the Nook ballnuts that I won't be needing. I'll sell them for $6 each (+shipping&paypal fee). PM me if you're interested.

[ataxy]

are the thread 15/16