Thread: Gantry advice please
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Yes those are correct bearings. Just tell Fred the f length you require but as I have said the ball screw length includes the f length . Its an easy mistake to make.
So just order say ball screw machined both ends 1610 x 1200 with f length of 30mm
(where 1200 is the total length)
For the avoidance of doubt my router has twin screws twin motors and the screws are 1450mm overall. Motors nema 23 . without any problems.Last edited by Clive S; 04-05-2019 at 01:49 PM.
..Clive
The more you know, The better you know, How little you know
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04-05-2019 #22
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04-05-2019 #24
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.
Sent from my SM-G900F using Tapatalk
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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..Clive
The more you know, The better you know, How little you know
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03-06-2019 #26
Pippin88,
How do you get 20m/min out of those motors direct-driving your screws? Is it something to do with the quality of screws you're using?
I can only get 7m/min direct-driving 1530mm of 2010 which (I thought) agreed with the theoretical max speed of the calculations I did.
On a 16mm pitch that same calculation says I could maybe get 12144mm/min on the same motors but that still seems way off what you're managing (and my gantry is light - made-from-plywood-light!).
MatthewLast edited by mattnedgus; 03-06-2019 at 11:09 PM.
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06-08-2019 #27
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06-08-2019 #28
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.
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07-08-2019 #29
Thanks. Looks easy enough.
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