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25-07-2014 #91
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25-07-2014 #92
I wouldn't worry too much about the stepper sticking out the side of the gantry (I'd have called that the Y stepper but there's no hard and fast rules) as it's just basically a metal lump there's not a huge amount to go wrong as you have it. If you can't design it such that it's internal maybe consider sticking a bent aluminium box around it. I managed to squeeze my Y stepper inside the gantry (see here) but it's pretty tight and I expect to be replacing the belt more frequently that usual. That's not quite the final design that I've gone for but it shows the basic layout.
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27-07-2014 #93
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27-07-2014 #94
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27-07-2014 #95
No problem JAZZ. I'm currently making some changes as we speak. A few questions are now arising:
1. What pulleys do most people go for? XL? Not sure on pitch etc.
2. Is there a way of extending motor shafts so that I can overcome this problem below?
3. Is 10mm of motor mount adjustment enough for belt tensioning?
Some progress on the Y axis too:
Last edited by biketrialsdave; 27-07-2014 at 07:23 PM.
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27-07-2014 #96
What most people do is rout out a recess for the stepper to mount in so you've got only maybe 5mm of material where the stepper sits (see here). That way you generally get enough shaft to mount a pulley on directly without needing an extension.
I don't think 10mm of movement will be enough for tensioning, especially not on a long belt. I'd go for more like 25 or 30mm if you can.
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27-07-2014 #97
#1 Use 15mm wide 5mm pitch HTD pulleys and belts.
#2 Need extensions made on lathe but much easier to use BK/BF bearings inot profile and belt/pulley like shown in my picture on other thread.
#3 20mm slot.Last edited by JAZZCNC; 27-07-2014 at 08:04 PM.
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28-07-2014 #98
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29-07-2014 #99
The stepper in the first two pictures looks large for the size of machine you are building, are the 34s? I would have thought 23's would be enough for a machine of this size, especially if you have slaved motors.
The connection between the gantry screw and the top plate (third picture) looks like a weak point. I'd try and make it thick enough that it covers most of the body of the ballnut.
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29-07-2014 #100
They are 23's. I think the model I am using has a particularly long body.
I agree with the ballscrew mount. Could make it 20mm plate (from 15) or increase that joint some other way...
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