Re: CoreXYNZ build August 28, 2016 01:24PM |
Registered: 11 years ago Posts: 1,049 |
Re: CoreXYNZ build August 28, 2016 01:42PM |
Registered: 9 years ago Posts: 125 |
From what I understand, the vertical extrusions behind the motors and idlers will be attached to the main vertical extrusions of the frame, so this will stiffen them up.Quote
cozmicray
I don't understand?
All these great milled brackets
and
Motor mounts of a piece of 2020 with 1 corner bracket?
Idler pulley mounts -- a piece of 2020 with 1 corner bracket?
Maybe a triangular brace on side?
Weak points like these make super machined brackets ---- useless
and system wobbly?
Re: CoreXYNZ build August 28, 2016 03:38PM |
Registered: 10 years ago Posts: 221 |
Don't worry cozmicray I haven't gone soft in the head quite yet. Here is the XY unit in the frame. I am also going to use Aluminium composite panel to further stiffen the frame.Quote
cozmicray
I don't understand?
All these great milled brackets
and
Motor mounts of a piece of 2020 with 1 corner bracket?
Idler pulley mounts -- a piece of 2020 with 1 corner bracket?
Maybe a triangular brace on side?
Weak points like these make super machined brackets ---- useless
and system wobbly?
Re: CoreXYNZ build August 29, 2016 01:20AM |
Registered: 10 years ago Posts: 221 |
Re: CoreXYNZ build August 29, 2016 12:09PM |
Registered: 11 years ago Posts: 1,049 |
Re: CoreXYNZ build August 29, 2016 04:09PM |
Registered: 10 years ago Posts: 221 |
Hi cozmicray thanks for your concerns. 2020 attaches to each other via these holes. I have these position holding nuts for the screws. The motor and idler brackets also screw to the main frame. I am nearly at the point of mounting the XY assembly into the frame. I just need to print some belt clamps.Quote
cozmicray
How are short 2020 sections attached to long 2020 rails?
Why not a plate that attaches to 2020 via holes and t-nuts.
It would provide stiffener to joint and stable mount for motor / idler.
Re: CoreXYNZ build August 29, 2016 09:47PM |
Registered: 11 years ago Posts: 1,049 |
Re: CoreXYNZ build August 30, 2016 12:48AM |
Registered: 10 years ago Posts: 221 |
Re: CoreXYNZ build August 30, 2016 11:38AM |
Registered: 11 years ago Posts: 5,780 |
Re: CoreXYNZ build August 31, 2016 03:00PM |
Registered: 10 years ago Posts: 651 |
Re: CoreXYNZ build August 31, 2016 04:09PM |
Registered: 10 years ago Posts: 221 |
I see where you are coming from. The brackets are 3mm thick and 45mm wide 90mm for both made from L section. I was able to flex one slightly but at a much bigger moment arm. I did a diagram to help visualise it. A you can see the bending is in the Z direction and the amount of movement in the Y direction is a little over half that also the moment arm acting on it is low. How much force do you think will be acting on them? Actually I am unconcerned by this and another issue that has been raised as I think there is adequate stiffness in those places and they are easy to fix if necessary. My main concern at the moment is the spring in the 6mm belts (quite easy to cange to 9mm) and resonance in the whole system.Quote
FA-MAS
I'm wondering about your motor mounts. Are those made from square tube or L angle? How thick are they and do they flex at all?
Re: CoreXYNZ build August 31, 2016 05:42PM |
Registered: 10 years ago Posts: 651 |
Re: CoreXYNZ build August 31, 2016 06:32PM |
Registered: 10 years ago Posts: 221 |
Those look nice. It was worth having another look at mine, they feel pretty rigid and I am happy to use them for the time being. I am set up for aluminium brazing so I could put in gussets if necessary.Quote
FA-MAS
I only ask cause I was looking down similar mounting methods for the motors in my design and wondered if they were going to flex all over the place. I may end up either just buying these or over engineering something involving getting some welding help.
Re: CoreXYNZ build August 31, 2016 07:33PM |
Registered: 10 years ago Posts: 221 |
Re: CoreXYNZ build September 01, 2016 07:43AM |
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Re: CoreXYNZ build September 01, 2016 04:05PM |
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Re: CoreXYNZ build September 01, 2016 10:03PM |
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Re: CoreXYNZ build September 02, 2016 01:49AM |
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Re: CoreXYNZ build September 02, 2016 04:13AM |
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Re: CoreXYNZ build September 02, 2016 06:34PM |
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Re: CoreXYNZ build September 02, 2016 07:51PM |
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Re: CoreXYNZ build September 02, 2016 11:49PM |
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Re: CoreXYNZ build September 03, 2016 06:32PM |
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Re: CoreXYNZ build September 06, 2016 12:58AM |
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Re: CoreXYNZ build September 06, 2016 07:44AM |
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Re: CoreXYNZ build September 06, 2016 08:51PM |
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Re: CoreXYNZ build September 07, 2016 12:25AM |
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Re: CoreXYNZ build September 09, 2016 01:19AM |
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Re: CoreXYNZ build September 11, 2016 04:58PM |
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Re: CoreXYNZ build September 12, 2016 10:22PM |
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