My CoreXY build log March 25, 2017 03:07PM |
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Re: My CoreXY build log March 27, 2017 11:08PM |
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Re: My CoreXY build log March 28, 2017 10:43AM |
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Re: My CoreXY build log March 28, 2017 12:29PM |
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the_digital_dentist
How did you manage to drill the holes in the frame so they are properly aligned and will allow your cam to position the guide rails parallel to each other? What did you use for a reference for the measurements?
You are absolutely right, it was only as a result of my measurements that I could know what offset was needed. And it was only at that point I realised that I hadn't thought about making sure the 2 rails were not just parallel, but co-planar (I think that's the right term?). Hence I had to make a total of 3 offset bushes. I also made an extension for my digi-vernier so I could accurately measure the distance between the 2 Y-axis rails and they were parallel to 0.01mm (this was not complete chance, but was mainly down to the accuracy of the initial drilling and boring in the mill before welding up)Quote
I don't think the cams guarantee that you can position the rails parallel to each other. Assume the holes are perfectly aligned and if you used installed the rails without the cams they would be parallel. Now add the cams- by rotating the cams to the same position you still have parallel rails, but they are no longer parallel to the frame. That's OK. Now assume that there's some random error in the hole positions and the rails don't start parallel. Your cams allow adjustment at a specific offset from the axis of the holes, lets pick a number like 0.4mm. If the errors in the hole positions aren't both 0.4 mm, your cam can't do the job you intended.
A similar method was pointed out to me by someone else, and to be honest I wish I'd have thought of it before. If you had one of those 3-screw mounting bushes on each end of the rail you would have fantastic adjustment for level/parallel/co-planar. If I was building again I would definitely use that method, the only reasons I don't adapt this build to use it is that 1, It seems to be working out as it is, and 2, I would lose too much on the Y-axis (I'm already pushing it to get a 300mm x 300mm build area out of a 375mm usable rail length)Quote
This would work because it allows any value of offset from the center (including zero) of the hole in the frame:
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You have to be careful at the other end of the rail to allow the end of the rail a little room to tilt otherwise you may cause the rail to flex when you make adjustments to the screws.
Re: My CoreXY build log March 28, 2017 03:30PM |
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Re: My CoreXY build log March 28, 2017 04:01PM |
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When you start from the frame, unless you build it grossly oversized, you won't be able to print as large as you intended.
Re: My CoreXY build log March 28, 2017 06:04PM |
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the_digital_dentist
. I've considered building a delta printer but I can't figure out any acceptable (to me) way to ensure that the vertical frame pieces are in alignment.
Re: My CoreXY build log March 28, 2017 06:10PM |
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Re: My CoreXY build log April 24, 2017 08:02AM |
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Re: My CoreXY build log April 24, 2017 08:05PM |
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Re: My CoreXY build log April 24, 2017 10:44PM |
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Re: My CoreXY build log April 25, 2017 01:30AM |
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Nice and chunky where it matters. I like it!
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the_digital_dentist
Are the X axis rails locked down in the Y axis bearing blocks somehow? If not, when you apply belt tension the Y axis bearing blocks will try to move toward each other and the mechanism may bind.
Re: My CoreXY build log April 25, 2017 11:41AM |
Registered: 9 years ago Posts: 3,525 |
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the_digital_dentist
I've considered building a delta printer but I can't figure out any acceptable (to me) way to ensure that the vertical frame pieces are in alignment.
Re: My CoreXY build log May 07, 2017 01:19PM |
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Re: My CoreXY build log May 08, 2017 01:05PM |
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Re: My CoreXY build log May 08, 2017 07:19PM |
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Re: My CoreXY build log May 09, 2017 01:36AM |
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Qdeathstar
Looks nice. Lots of machining.. Why did you decide to go with shafts instead of rails?
Re: My CoreXY build log May 09, 2017 01:59PM |
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Re: My CoreXY build log May 09, 2017 06:46PM |
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Re: My CoreXY build log May 24, 2017 12:43PM |
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Re: My CoreXY build log May 26, 2017 01:21PM |
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Re: My CoreXY build log May 26, 2017 07:27PM |
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Re: My CoreXY build log May 27, 2017 01:59AM |
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Qdeathstar
Looking pretty skookem. What kind of mill do you got? I really want to get one... was debating between a grizzly or a pm.... with power downfeed and dro. I doubt I'll want to go cnc
Re: My CoreXY build log June 01, 2020 03:43PM |
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Re: My CoreXY build log June 01, 2020 04:11PM |
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Re: My CoreXY build log June 02, 2020 05:37AM |
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Re: My CoreXY build log June 17, 2020 12:11PM |
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Re: My CoreXY build log June 21, 2020 04:14PM |
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Re: My CoreXY build log June 21, 2020 04:55PM |
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Re: My CoreXY build log June 22, 2020 08:38AM |
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cozmicray
Please get some socket head bolts and a set of hex drivers
Phillips head screws for wood working (maybe)
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Bed
See Digital Dentist:
UMMD 3D Printer Bed Design
[drmrehorst.blogspot.com]
You may need Kinematic Leveling with steel / aluminum interfaces
aluminum lead screw block to steel bed to aluminum bed plate
thermal differences
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Updates to be support design here: [drmrehorst.blogspot.com]