1200mmX900mmX170mm 4axis cnc

[Nickhofen]

Sorry I forgot to mention that the total height is 280mm.
I have read at another thread here , that to eliminate the forces when Z axis is cutting, the carriege must be at least at 250 mm from their outer sides.

I fount another thread "http://www.mycncuk.com/threads/8975-Linear-rail-question?p=88244#post88244", one that you have start Robert (Nr1madman), where Jazzcnc states that 160mm for Y axis height is good enough!
Time to redesign !

[Nr1madman]

I fount another thread "http://www.mycncuk.com/threads/8975-Linear-rail-question?p=88244#post88244", one that you have start Robert (Nr1madman), where Jazzcnc states that 160mm for Y axis height is good enough!
Time to redesign !

Hohoho you know the phrase "seek and you shall find". Well done ;)

But if I remember correctly my choice was 80x160 profile for gantry but jazz and Boyan stated that 2pcs of 80x40 is plenty enough in L formation. That gives the gantry a hight of 120mm!

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[Clive S]

Hohoho you know the phrase "seek and you shall find". Well done ;)

But if I remember correctly my choice was 80x160 profile for gantry but jazz and Boyan stated that 2pcs of 80x40 is plenty enough in L formation. That gives the gantry a hight of 120mm!

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I think I have seen Jazz use 90 by 45 as that is the correct spacing for 20mm rails in profile

[Nickhofen]

I think I have seen Jazz use 90 by 45 as that is the correct spacing for 20mm rails in profile

90x45 each tube Clive? And what spacing between for the screw can we say that is ideal?

[Clive S]

90x45 each tube Clive? And what spacing between for the screw can we say that is ideal?

Not sure what you mean by this the two profile are fitted together to make an L so the lower one is horizontal with the other one sitting on top vertical, the BK and BF bearings for the screw will fit the slots in the profile

[Nickhofen]

Not sure what you mean by this the two profile are fitted together to make an L so the lower one is horizontal with the other one sitting on top vertical, the BK and BF bearings for the screw will fit the slots in the profile

Thanks Clive, now I get it.

[Nr1madman]

Not sure what you mean by this the two profile are fitted together to make an L so the lower one is horizontal with the other one sitting on top vertical, the BK and BF bearings for the screw will fit the slots in the profile

You are correct as always ;) but I think the smaller 80x40 was okay strength wise, just alot more handy with the 90x45 because of the bearings and the clever bolt on approach

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[Clive S]

You are correct as always ;) but I think the smaller 80x40 was okay strength wise, just alot more handy with the 90x45 because of the bearings and the clever bolt on approach

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Exactly, better job all round the bolt holes are perfect for the 45x90