Re: [Emc-users] Yet another topic about gantry homing

On Saturday 06 October 2018 00:56:58 Gene Heskett wrote: > On Friday 05 October 2018 23:24:38 Chris Albertson wrote: > > A third option is a REALLY long belt. It is long enough to make a > > double pass on each side and needs about 8 pulleys but you only need > > one motor. I saw one of these on

Re: [Emc-users] Yet another topic about gantry homing

On Friday 05 October 2018 23:24:38 Chris Albertson wrote: > A third option is a REALLY long belt. It is long enough to make a > double pass on each side and needs about 8 pulleys but you only need > one motor. I saw one of these once but it used a kevlar cable, not a > belt > > I think the shaft

[Emc-users] Yet another topic about gantry homing

Of course you can remove the nut. You just roll it onto a correctly sized former. In fact it's a good idea to do this with the linear slides and ballscrews from china, to give them a wash. While they are greased up and wrapped in plastic, they are often covered in grinding grit which won't help th

Re: [Emc-users] Yet another topic about gantry homing

A third option is a REALLY long belt. It is long enough to make a double pass on each side and needs about 8 pulleys but you only need one motor. I saw one of these once but it used a kevlar cable, not a belt I think the shaft is move simple but but you need precision mechanics to adjust it. It

Re: [Emc-users] Yet another topic about gantry homing

They are on ebay. Yousearch for "ball screw" and they come up. Here is an example: https://www.ebay.com/itm/SFU1204-RM-Rolled-Ball-Screw

Re: [Emc-users] Yet another topic about gantry homing

On Friday 05 October 2018 11:12:01 Dave Cole wrote: > Chris, > > Do you have a link for these "new style ball screws" ?? Just do a google search. The prices seem to be in freefall. The 1 start, 25x5x1450mm screw and nut, with bearings I paid right close to $180 usd + ship, about $200, for the Z

Re: [Emc-users] Test of AC servo motors

On 10/04/2018 12:31 PM, Bengt Sjölund wrote: Hi Jon, Can not find any information but I assume they are PM. These are Mavilor BL series with resolvers ( BLS ) To test, short the motor wires together. If the shaft is very hard to turn, it is PM. If the shaft is just as easy to turn as with

Re: [Emc-users] Yet another topic about gantry homing

By the time you buy the timing belts, pulleys, shafts, machine the brackets, to do a double belt reduction to get to 10:1, you are money ahead to just buy a servo grade 10:1 gearbox.    If you mount a pinion directly to the gearbox shaft and drive the rack with this pinion, you will have a very

Re: [Emc-users] Yet another topic about gantry homing

Chris, Do you have a link for these "new style ball screws" ?? Thanks,  Dave On 10/4/2018 3:33 PM, Chris Albertson wrote: Have you seen the new style ball screws? They are now cheaper then belts and have pretty "over kill" specs. The problem with a 30mm wide belt drive is the need to resist

Re: [Emc-users] Making minor progress on the laser setup

On Friday 05 October 2018 06:51:59 andy pugh wrote: > On Fri, 5 Oct 2018 at 03:01, Gene Heskett wrote: > > By then it was dinner time+ so I quit for the night. I'll thread the > > second tube tomorrow, and mark it for length for cutting after I > > turn it around in the lathe. Then figure out a

Re: [Emc-users] Making minor progress on the laser setup

On Fri, 5 Oct 2018 at 03:01, Gene Heskett wrote: > By then it was dinner time+ so I quit for the night. I'll thread the > second tube tomorrow, and mark it for length for cutting after I turn it > around in the lathe. Then figure out a design for a slip ring insert > and brush carrier so I can p

Re: [Emc-users] Yet another topic about gantry homing

On Thu, 4 Oct 2018 at 19:45, Leonardo Marsaglia wrote: > I would love to have ballscrews but I thought I would need to large of a > diameter to avoid them to whip. Remember that I have a 3.8 meters in lenght Have a look at the Bell Everman "Servobelt" concept. I believe it uses standard metric