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peterg1000 schrieb: Hi FaFiNoS,
Perfect - thank you. All the critical information is there.
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FaFiNoS schrieb: Hi guys,
One more thing. To get the nuts perfectly inline with lead screws bearings/motors you need to grind the carry nuts or gantry (as I did), just little bit, 0.4 - 0.5mm should be enough. I grinded more, around 1mm so my ball nuts not touching gantry at all.
I completely forgot about this Still too excited how machine works Sorry about that.
Attached STL file with all four holders. Please note each holder is designed to specific hole in gantry. Holders with longer part for M6 screw are for Y axis.
That's definitely all, no more modifications.
FaFiNoS
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Yes. Accordingly to the Eichenberger catalog (page 22 here ) the ball-diameter for types coded as 10x3 FGRHxxx is exactly 2 mm (Look at the column reporting the Dw size).peterg1000 schrieb: Ball diameters are 1.71mm, and the Stepcraft screw looks to be able to accommodate nearer 2mm (cant measure this exactly). I can only conclude that the Eichenberger ball nut uses a larger size since the original experimenter reported little or no backlash.
I am wondering whether to risk £90 on one of the Eichenberger ball nuts !!! Motivation not high at the moment!!
Peter.
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The backlash with the new nuts is very low and the cost of replacing them is very low. Also it ensures the wear is on a cheap components, as replacing the rods would be very uneconomical. Bronze nuts has been used as a wear component in machines for ages and has a very reliable record with regard of wear. The new nut with adjustable pre-load seems like the best solution.julius schrieb: The backlash goes almost to zero?
Maybe the wearing will progressively augment the backlash, but I think it will be limited to few cents of millimeter, IMO.
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You missed the point here: the new nuts are not available for old SC1 steppies. The old machines use an 8 mm leadscrew instead of 10 mm.eiaro schrieb: The new nut with adjustable pre-load seems like the best solution.
Two guys of the forum made this mod before, they are quite satisfied.eiaro schrieb: The balls in a ball bearing is very very hard, and running those on a regular hardened rod will quickly wear down the rod. To me it seems like risking a high replacement cost for a short-lived joy, and there is no going back when you get wear on the rods.
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Ah, sorry. I missed that.julius schrieb: You missed the point here: the new nuts are not available for old SC1 steppies.
Doing a hardness test on the rod would probably be a good indication.julius schrieb: Also, one has to look to quality of the steel used from Stepcraft. It seems good to me, so (maybe) there will be no so huge wearing by adopting ball-nuts...
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