Gantry advice please

[AndyUK]

Thank you for all your information.

I think I will go with
1610 x 900mm x 2 for y axis
1610 x 1200 for x axis ( gantry )
1605 for z axis ( still sorting out the lenght )
Going to get ends machined to suit pulleys.

20mm square linear rails all round.

Does this sound ok ??

Thank you

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Your X axis is quite long for 16mm - You'll get a 12mm root diameter on these, which means assuming you use a BK and a BF, you'll have a max speed of 1000rpm before whipping. With the 10mm pitch you're okay because it sets your max rapids of 10m/min - definitely wouldn't want to go 1605 though! A 20mm screw instead will give you a max rpm of 1260 which bumps your possible rapids up to 12.6m/min, but will take slightly more power from your motors.

The Y axis gives you a max rpm of 1800, which is fine.

[Crunch]

Your X axis is quite long for 16mm - You'll get a 12mm root diameter on these, which means assuming you use a BK and a BF, you'll have a max speed of 1000rpm before whipping. With the 10mm pitch you're okay because it sets your max rapids of 10m/min - definitely wouldn't want to go 1605 though! A 20mm screw instead will give you a max rpm of 1260 which bumps your possible rapids up to 12.6m/min, but will take slightly more power from your motors.

The Y axis gives you a max rpm of 1800, which is fine.

That is where I started with 2010 on x axis
To stop whip as I had read so much.
The more I read the harder the decisions.

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[AndyUK]

That is where I started with 2010 on x axis
To stop whip as I had read so much.
The more I read the harder the decisions.

Well it was routercnc who said stick with the 16mm due to the added intertia of the 20mm. The man has built four of these things, he knows what hes doing.

I'm saying they'll work, but realise that they'll limit your rapids more than 20mm will. Personally I'd be more than happy with 10m/min rapids - You'd need some pretty strong motors to get up there anyway with a 100kg gantry.