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11-06-2015 #1
Oh very hard to answer because depends on the end fixing etc but I wouldn't go above 2000mm and at that I would have Both ends with Fixed bearings and slight preload on them. When I build 4x4 size machine I always use Fixed/Fixed end bearings as the slight cost difference is worth the extra support it gives.
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12-06-2015 #2
To work out the critical speed of a screw there is a calculator on our site.
http://www.zappautomation.co.uk/inde...lculators.html
In the lower part of this page is a link for the calculator.Visit Us: www.automationshop.co.uk
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21-06-2015 #3
I'd brace your ballnut mounts, they just look a little flimsy compared to the rest if it. Looking good!!
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21-06-2015 #4
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21-06-2015 #5
Yep just beef up the Ballnut mounts and your set to go.!
One thing I see is that you don't have much room for adjustment or alignment with that threaded bracket setup so give a little thought to how you'll do this for both directions. Ballnut housings tend to be easier to adjust than fastening ballnut direct to plate like that.
Those little white brackets sticking out on the end plates are those for triggering limit switches at each end.? . . . If so have you thought about using a traveling switch and save your self a lot of wiring and messing around with brackets etc. I do all my machines this way and it saves alot of work and easy to setup.
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21-06-2015 #6
Thanks guys! Improvements implemented.
Those little white brackets sticking out on the end plates are those for triggering limit switches at each end.? . . . If so have you thought about using a traveling switch and save your self a lot of wiring and messing around with brackets etc. I do all my machines this way and it saves alot of work and easy to setup.
Simple and ingenious - for sure I will also implement this!
I will go ahead and order my stuff from BST Automation.
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21-06-2015 #7
Thats better.
I believe Dean meant 2 switches per axis, one wired home other wired like limit. With the benefit of all limits and all homes wired together respectively with the exclusion of the A home switch /second long axis/ which has to be wired separately, so you could perform gantry squaring
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01-11-2015 #8
Agreed, your work on this looks super sweet, should be a nice solid machine frame, nice one Toomast!
.MeLast edited by Lee Roberts; 01-11-2015 at 07:52 PM.
.Me
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05-11-2015 #9
As I have invested a lot of time and money into this project I don't want to create unnecessary problems with cheap components. I know that lot of people use them and are happy but I don't want to waste any hour or even days for troubleshooting - just to find out the fault was the dirt cheap BOB ;)
Any other recommendations for BOB?
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05-11-2015 #10
CSMIO all the way if you want a good one...
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