Thread: Fixed Gantry machine design tips
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08-05-2020 #1
I am looking at the possibily of changing my design to a Fixed Gantry type machine.
Are there any Golden Rules for designing this type of machine?
ie Location of Gantry on the frame or the length of ball screws needed to obtain full ned travel. that sort of thing?
If my question is too vague, apolagises...I am just trying to learn the best way, to save re-work.
Steve
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09-05-2020 #2
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09-05-2020 #3
Why Size of the machine as nothing to do with it.!
If you have the extra space it requires then a fixed gantry will always be stiffer than a moving gantry by the simple fact your not having to deal with a moving Mass so can build it stronger with no penalty other than extra length.
Some of the largest CNC machines in the world are Fixed Gantry machines.!-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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10-05-2020 #4
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10-05-2020 #5
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10-05-2020 #6
Yes, I'd be moving the shorter distance of the table, ie 480mm so I need ~ 900mm rails and balls crews for that axis
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10-05-2020 #7
The other reason i dont like long and wide for that matter Fixed gantry, is that the table that moves has to ve sturdy and the only solution there is a very expensive aluminum plate, while you can throw anything you have at hand for the bed . Also a protection should be done for the ballscrews
And as the table grows, the motors will grow and the machine will grow slower.
Not a problem though if you will be cutting metal mainly
I still believe the Z is the most important thing, not only the gantry , if gantry properly made. And i can prove it to anybody how a 2 meter wide gantry cuts up to mild steel with mirror like finish. And aluminum like butter.
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10-05-2020 #8
It's all a matter of degree of difficulty and expense.!. . . .Give me enough money and I could build you a Fixed or moving gantry 5 axis machine with 20Mtr travels that will cut titanium like butter.!! . . . The simple fact is that a Fixed gantry will always be stronger because it can be over engineered with less cost in terms of effect on performance and component cost. Downside is it takes much more room.
Your Machine Boyan is a credit to you, but it's massively over engineered for what it's doing which cost's extra money that isn't really required. It's also well beyond what most people can achieve in there little sheds or garages with limited tools. Some people don't want to pay for a whole machine much more than what you paid for the 3mtr straight edge.!!
A fixed gantry machine is a good choice if you have the room as it allows you to get high strength without having the expense of building a very strong and heavy moving gantry which requires bigger better motors etc.-use common sense, if you lack it, there is no software to help that.
Email: [email protected]
Web site: www.jazzcnc.co.uk
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26-08-2024 #9
I see you have done the above calculation and I was wondering if there is a calculator you used ?
I have 750mm and 650mm SFU1605 ball screws and would like to use them to build a fixed gantry desktop sized cnc. Main use for aluminium and some wood and plastics.
With 650mm ball screw for x-axis and 750mm for y-axis roughly, any idea of how much workarea I will be able to get?Last edited by MikeG; 27-08-2024 at 10:39 AM.
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