2x RM2005 C7 Ballscrew 1450mm length and SFU2005 ballnut complete with FK (including the lock nut) and FF mounts. Also includes a flexible motor coupler with 8mm dia bore to fit standard nema 23 shaft.
You can consider these new as although they were fitted to my machine its never cut anything. Ideal for a 4ft axis.
Delivery is an option but will be expensive because of the weight and length. Would prefer collection if possible.
Bargain at £60 each or £110 for the pair. You'd normally pay £200+ for these from China not to mention the chance of VAT and import duty on top of that.
Here's a sketch showing the exact dimensions
And a couple of images
Last edited by Jonathan; 13-02-2013 at 04:49 PM. Reason: Sold
If they where 2010's I would of ripped your arm off.
I will have a think about your 2005's, and speak to the boss (wife) about it."If first you don't succeed, redefine success"
I'm interested in the ballscrews and would appreciate some advice. I'm building a small machine approx 800mm x travel and 600 y travel. Gantry mass approx 20kg (+/- 2kg) with spindle. Would 2005's be up to the job?. i haven't got around to the calcs yet but for my machine I can just machine them to the right length.
Thanks in advance for any help / advice you may be able top offer
Sold to the man with the hobnobs (John).
I'll be honest and say that I've swapped these out on my machine for 2010 as they're just too slow for cutting wood on the end of a nema 23. These small motors only run up to about 1000rpm with reasonable torque. Spinning at that speed the most you can reliably expect is about 5m/min traverse but little torque left for cutting. This is fine if your doing a lot of metal routing where your usually around 1m/min or less but for MDF like I do its just not fast enough where you need to be cutting 4-5m/min usually.
Depends what your cutting the most really! Judging by your gantry weight its not a lot so doubt it will be for metal. If your mostly cutting wood go for 2010 or even 2020 if your using the latest digital drives and suitable motors as these have very fine resolution using realtime microstepping adjust and signal input interpolation. If its metals then 2005 or 2010 would be fine.
Thanks for letting me know . . mate.
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Last edited by Lee Roberts; 29-12-2012 at 09:36 PM. Reason: re: considered as a joke
I considered buying them, for about 20 seconds.
The only thing this size ballscrew is good for is maybe a big milling machine or lathe. For other machines, like CNC routers, the forces on the ballscrews are so low that you don't need the slight increase in stiffness gained from using a RM2005 screw, hence you're much better off sticking with 16mm ballscrews and the appropriate pitch. The price was good, but to me that's not enough to counter the poor performance you'll get on a router with these, especially since it could increase the cost of the electrical parts. Presumably John S has a big machine to convert...
Last edited by Jonathan; 29-12-2012 at 02:32 PM.
Presumably John S has a big machine to convert...
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