my build

**jonm** · 02-08-2009

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supported rail and bearings , stepper motors arrived from zapp ( thanks gary) so i made up two carridges and mdf box (still to screw and glue ribs inside box) supported rail will be bolted to mdf box , box will be bolted to base . that gives me 200mm from base to carridge , should keep x and y axis close together

**jonm** · 02-08-2009

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built the gantry sides today

**Lee Roberts** · 02-08-2009

looking good !

**jonm** · 03-08-2009

hi kip
nothing wrong with agricultural take a tractor for example ... not the lamborghini of vehicles ... but it does what its supposed to do very well ....

think you should upgrade your bed:rofl:........

now

any ideas for securing 12mm lead screw without machining the ends
would this do

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**irving2008** · 03-08-2009

Originally Posted by jonm

hi kip
nothing wrong with agricultural take a tractor for example ... not the lamborghini of vehicles ... but it does what its supposed to do very well ....

think you should upgrade your bed:rofl:........

now

any ideas for securing 12mm lead screw without machining the ends
would this do

Are you using 12mm studding or 12x3trapezoidal? A 12mm ID bearing will sort of do, but the fit will be poor. Better to machine the ends down to 8 or 10mm for a good fit on a suitable bearing and thread them for a locking bolt. have you considered how you are going to manage end-float?

**jonm** · 03-08-2009

thanks irvine

using 12 mm trapeziod .. would the 2 grub screws in the pillow block not hold the screw against any lateral movement .... can the bearing take axial load ,.. was looking for a way round this as i dont have a lathe

**jonm** · 03-08-2009

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built basic gantry this morning , threaded rod will pass through gantry sides bolting it all together , will also be bolted down through carridge angle iron(bed frame)

**irving2008** · 03-08-2009

Originally Posted by jonm

thanks irvine

using 12 mm trapeziod .. would the 2 grub screws in the pillow block not hold the screw against any lateral movement .... can the bearing take axial load ,.. was looking for a way round this as i dont have a lathe

Those type of bearings are poor at axial load, they can handle some but are not good for locating the shaft axially, which is what is needed to minimise backlash. Somewhere you need thrust bearings to take the axial load or angular contact bearings (hard to get in small diameter ID).

**Lee Roberts** · 03-08-2009

Originally Posted by Kip

What is...Be specific...is it the agricultural appearance or the use of bed frame?

Both !

**tribbles** · 08-08-2009

That's quite impressive - I've tried that technique before (although only turning the ends of bolts), and I wasn't that successful.

Mind you, I was using an electric drill as a lathe held in one hand, and the other hand holding the grinder

I was also not really after precision (just wanted a nice chamfer on the end - it wasn't very neat, but did its job).