CoreXY Enclosure, frame, and tips Questions. March 11, 2017 11:32AM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 11, 2017 01:59PM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 11, 2017 02:15PM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 11, 2017 04:47PM |
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Quote
Qdeathstar
Hi,
I am looking to build a core XY using this design:
[www.thingiverse.com]
I have a few questions.
1) It uses printed parts for the frame. Are their suitable metal corners that I could use instead, and are they worth the extra cost? I know for delta's getting the frame right is crucial. I also see that it uses cheap bearings with deldrin wheels. However, the open builds store offers premium polycarbonate wheels with bearings. Are those worth paying 3x the cost for? Finally it uses aliexpress-special lead screws, is there a great difference in quality? Which lead screws would you recommend.
Get metal corners from Ali express They are probably the same cost as the plastic. Also get linear rail from Ali express. They are easy to deal with and do not extend past the frame. So if you can move the motors inside the frame too you can attach the enclosure panels to the frame and not have a separate enclosure. My CoreXYNZ thread has links to the suppliers so you can do a quick price comparison
2) For cutting extrusions, I have a table saw with a non-ferrous metal blade. But, how accurate do the cuts need to be? Im a novice at cutting. Would it be significantly better to have the extrusions cut at a machining shop if I suspect my tolerances if I cut them would be between 2-3mm?
Accuracy depends on the way you put together the frame. If you can build in some adjust-ability then a millimeter here and there is OK. I would go with your table saw with a decent fence to get lengths the same.
3) It looks like the stepper motors would be inside any enclosure I designed to build. How have people dealt with that in the past?
Just make some ali brackets to attach to the frame, there are plenty of examples here. If you are not comfortable with making them I am pretty sure I have seen commercial items.
4) I have plenty of 1.8 stepper motors. For a coreXY are .9 steppers worth the extra cost? (eg, having to buy them vs having them on hand)
Go with the 1.8 degree and change them out if you are not happy with them.
Also, any other things you think I should know! Thanks
Re: CoreXY Enclosure, frame, and tips Questions. March 11, 2017 07:43PM |
Registered: 8 years ago Posts: 601 |
Quote
Qdeathstar
Hi,
I am looking to build a core XY using this design:
[www.thingiverse.com]
I have a few questions.
1) It uses printed parts for the frame. Are their suitable metal corners that I could use instead, and are they worth the extra cost? I know for delta's getting the frame right is crucial. I also see that it uses cheap bearings with deldrin wheels. However, the open builds store offers premium polycarbonate wheels with bearings. Are those worth paying 3x the cost for? Finally it uses aliexpress-special lead screws, is there a great difference in quality? Which lead screws would you recommend.
2) For cutting extrusions, I have a table saw with a non-ferrous metal blade. But, how accurate do the cuts need to be? Im a novice at cutting. Would it be significantly better to have the extrusions cut at a machining shop if I suspect my tolerances if I cut them would be between 2-3mm?
3) It looks like the stepper motors would be inside any enclosure I designed to build. How have people dealt with that in the past?
4) I have plenty of 1.8 stepper motors. For a coreXY are .9 steppers worth the extra cost? (eg, having to buy them vs having them on hand)
Also, any other things you think I should know! Thanks
Re: CoreXY Enclosure, frame, and tips Questions. March 12, 2017 01:26AM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 12, 2017 07:38AM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 12, 2017 11:02AM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 12, 2017 11:04AM |
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Quote
sigxcpu
2) Cut them a bit longer, make a pack where you want the same length, align one end and cut them all at the same time at the other end.
Do not use printed corners. If extrusion is thick enough you don't need brackets either. I just finished a CoreXY build and all the frame joins (2040) are done like this:
[cdn.instructables.com]
The frame is sturdy enough and I expect it to be even better when I'll put the walls.
Printed corners look ugly and it is more work to be done with less gain.
Re: CoreXY Enclosure, frame, and tips Questions. March 12, 2017 07:31PM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 13, 2017 03:41AM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 16, 2017 07:18PM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 17, 2017 01:08AM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 17, 2017 06:25PM |
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Re: CoreXY Enclosure, frame, and tips Questions. March 17, 2017 06:51PM |
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Quote
Qdeathstar
When you say scrapyard, do you mean the place where I drop off scrap metal like copper? I've been there several times as an electrician turning in copper and I've never seen any tslot or heard about them selling it.
When I ask about it, do I ask "do you sell t-slot" or is there another trade name?
Quote
Qdeathstar
Would you consider 4 guide rails and two belts running up the z axis to be superior to the lead screws? Do belts really make a difference in z banding if you use the optimal z-height for your lead screws?
Re: CoreXY Enclosure, frame, and tips Questions. March 17, 2017 08:16PM |
Registered: 8 years ago Posts: 338 |
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Helps you to select layer height in a way, that Z axis moves only by full step increments. Z axis isn't usually enabled during inactivity. If the axis is disabled during micro-step, axis jumps to the closest full step and intorduce error. This effect is occuring to some extent even while leaving the Z axis motors enabled. This is most usefull to machines with imperial leadscrews but also for unusual layer heights with metric leadscrews.
Re: CoreXY Enclosure, frame, and tips Questions. March 20, 2017 02:03PM |
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Re: CoreXY Enclosure, frame, and tips Questions. April 23, 2017 11:32PM |
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Re: CoreXY Enclosure, frame, and tips Questions. April 24, 2017 02:59AM |
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