Gantry advice please

[Crunch]

Pippin88

Only because it only travels a short distance. So thought 5mm pitch was fine for that.

And I don't know . Lol

I've read loads of builds and most use 5mm pitch . But I'm open to advice.

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[AndyUK]

Only because it only travels a short distance. So thought 5mm pitch was fine for that.

And I don't know . Lol

I've read loads of builds and most use 5mm pitch . But I'm open to advice.

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I used 1605 on my Z. Thoughts were rapids are less of an issue as you're travelling the smaller distance, and theoretically the fine pitch gives you twice the height resolution.

At a stretch, maybe thats better for surface finishes?

[Crunch]

I like the ajustable bed.

How wide are the plates top and bottom of your gantry. As you have slotted your gantry for ball screw.
I like the look of your gantry.

The slot in your gantry is what I had planned for my box steel,so I could fit the ball screw inside. But I didn't realise how much strength I was going to lose. I ordered 8 mm thick to allow for it. After posting here and getting the information realise it will weaken it to much.



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[Clive S]

If I was doing it again I probably would have used heavy duty ali profile formed in a L shape. But that was my first router.. Gantry front plate 1000x210mm
Some pics here:- https://photos.app.goo.gl/cfbXGLBdxYvB9s536

[Max Maker]

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.

Could you make that calculation for a 2.2m long ballscrew? I only have 2010 available so far.

[Neale]

Could you make that calculation for a 2.2m long ballscrew? I only have 2010 available so far.

If you Google for "critical speed calculator", you will find a number of sites where you can plug in your dimensions and check for max speed. They all give slightly different answers but you will get a good idea of what might be possible. Then you can play with different lengths, motor/screw gearing, etc, to meet your needs. For example, my machine is configured more for acceleration than speed as I do a lot of fine work where I seldom hit maximum speed anyway.

[Max Maker]

Thanks. Looks easy enough.