My flying gantry machine

**Lee Roberts** · 31-08-2009

No problem on the length of the rail for the bearings mate, irving will be the man when it comes to the maths on rail lenths as he has looked into rail flex before.

If it was me and i was looking to use 16mm rail, i would only use it on the Z axis with an overall length of 300mm MAX. For the 20mm rail i would goto say 6-700mm MAX.

Irving if you please

**AdCNC** · 01-09-2009

ive got a few lengths of more substantial rail and block with end caps for sale 25mm i dont think that would flex over 3ft! but i could be wrong:whistling:

**progomez** · 02-09-2009

Originally Posted by AdCNC

ive got a few lengths of more substantial rail and block with end caps for sale 25mm i dont think that would flex over 3ft! but i could be wrong:whistling:

How much would they be?

**progomez** · 21-09-2009

Ive picked up a cheap wood lathe with 4 jaw chuck off ebay so will try and make a ridge on the delrin nuts (once I figure out how to centre the nut)

I also decided to make a smaller 400/400/200 cnc and then in time buy one of the kits off ebay (from china) which has the supported rails and make a 4'by2' cnc.

Ive also joined a cnc course at my local college. Its shows how to manually program haas machines but also in time Im hoping to be able to use these machines to mill some parts out of alu.

**irving2008** · 21-09-2009

Originally Posted by progomez

Ive picked up a cheap wood lathe with 4 jaw chuck off ebay so will try and make a ridge on the delrin nuts (once I figure out how to centre the nut)

I also decided to make a smaller 400/400/200 cnc and then in time buy one of the kits off ebay (from china) which has the supported rails and make a 4'by2' cnc.

Ive also joined a cnc course at my local college. Its shows how to manually program haas machines but also in time Im hoping to be able to use these machines to mill some parts out of alu.

To centre the nut you need a dial gauge and stand which can be got off ebay relatively cheaply. basically the trick is to adjust one pair of opposing jaws until rotating the chuck 180deg produces no offset, then repeat for the other pair.

Be careful not to crush the nut tho...