Stabilizing Ormerod 2 September 09, 2016 06:19AM |
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Re: Stabilizing Ormerod 2 September 11, 2016 03:55AM |
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Re: Stabilizing Ormerod 2 September 11, 2016 03:01PM |
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Quote
cua193
Dave,
"only if I adjust the bed immediately before starting the print as the Ormerod is not solid enough to retain its adjustment well."
Exactly what I was saying months ago as my Ormerod 1 fell to bits. I was in a worse position as I couldn't print replacement parts & had to make an all metal chassis. I used some 1/2" dural which I've had for 40 years waiting to be used & 4" x 2" x 2" x 1/4" angle which was also waiting to be used. . Ormerod168 also has a more elegant looking solution using angle, if I were starting from scratch I'd have used the same.. The main problem, as you've found, is that there's a twisting moment around the y axis as the carriage moves across, the plastic pieces of the standard Ormerod just aren't man enough for the job, they're constantly being strained and will inevitably fail.
I also redesigned the bed to put the bearings as far apart as possible & increased the pitch of the ground rods from 85mm to 130mm. The original holes are visible in one of the pics - you can see how much more stable it is without increasing the footprint. I cut a triangular bed & the end pieces from a sheet of 250 x 250 aluminium, bought on ebay.
All this extra work means that I could throw my printer at the wall & would retain near perfect alignment. I haven't had to adjust the bed alignment since I first assembled it. The metal parts could, with a deal of revamping, be printed in plastic. I'd be quite happy to share the .dxf & stl. files.
Richard
Re: Stabilizing Ormerod 2 September 12, 2016 10:26AM |
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Quote
Treito
... I am also designing a new CoreXY-Printer. ... The main difference between us is that I want to keep the moved mass as low as possible so I will use two bowden Extruders.
Re: Stabilizing Ormerod 2 September 12, 2016 10:42AM |
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Quote
Treito
I have no issues with the spring-loaded Extruder. It is not skipping, but I get symptoms of an unstable frame like the ghost shadows at old analogue antenna tv..
Re: Stabilizing Ormerod 2 September 17, 2016 10:40AM |
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Re: Stabilizing Ormerod 2 September 21, 2016 03:55AM |
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Re: Stabilizing Ormerod 2 September 21, 2016 05:04PM |
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Quote
Davek0974
I have a feeling that friction will kill your design I'm afraid - personally i would not go that way. There are no rotating elements in either of those parts - just relies on slip of the nylon used.
Stuff like this will last a lifetime...
HiWin Rails
Ball Screws
Clearly the cost will higher and be an issue probably but the results would be measurable i think, the two links are just examples of course but HiWin is regarded highly.
A step down from HiWin is round supported rods...
Round supported rods
Cheaper and will probably be ok in this use - not good for high stress like milling machines.
Loads of ideas.....