Trueing bed to towers proves quite difficult; Is it essential? December 10, 2015 04:20PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 10, 2015 05:08PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 10, 2015 06:39PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 10, 2015 06:55PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 10, 2015 08:29PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 03:10AM |
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nebbian
Realthor,
Could you be measuring a twist in the top frame, relative to the bottom frame?
If your square isn't perpendicular to the two smooth rods, then you might be seeing a twist.
Alternatively your square might not be square.
Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 08:25AM |
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dougal1957
To test the accuracy of your square place it against a straight edged board and draw a line down the rule part then flip the square over and check the line still lines up to the rule part?
Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 08:47AM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 09:37AM |
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dc42
I still don't understand exactly what problem you are describing. The bed is obviously slightly tilted with respect to the horizontal, but this could just mean that the printer is not standing on a level surface, or the feet at the bottom do not all have the same height. When you hold the spirit level against the rods, are they all exactly vertical, in both directions?
To a first approximation, towers leaning slightly in a radial direction can be compensated by shifting the tower positions, which will be done by auto calibration.
Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 11:04AM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 01:30PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 01:45PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 02:08PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 02:21PM |
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realthor
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dougal1957
To test the accuracy of your square place it against a straight edged board and draw a line down the rule part then flip the square over and check the line still lines up to the rule part?
Hmm, I am afraid I don't follow.
.
Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 02:44PM |
Registered: 11 years ago Posts: 5,780 |
Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 03:21PM |
Registered: 9 years ago Posts: 1,035 |
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dougal1957
Quote
realthor
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dougal1957
To test the accuracy of your square place it against a straight edged board and draw a line down the rule part then flip the square over and check the line still lines up to the rule part?
Hmm, I am afraid I don't follow.
.
Ok
to test the accuracy of your square do the following place the square against a straight edge and draw a line on say a piece of paper Pic 1
then flip the square over and repeat pic 2
then check that the lines line up and if they don't like mine in pic 3 then your square is NOT Square
Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 04:04PM |
Registered: 9 years ago Posts: 1,035 |
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the_digital_dentist
Aligning 3 linear guides would be tricky, putting 6 guide rails in parallel seems like a nightmare. You have quite a task ahead of you, but kudos for trying to measure and understand. You're ahead of 95% of 3D printers out there.
I use one of these to do the rough alignment in my printer. I don't trust its absolute accuracy down to 0.02 degrees, but it is much better than a bubble level and it actually gets my bed level enough to print on over most of its surface. I used it to roughly align the guide rails of the X and Z axes and had to make only minor shifts in the guide rail positions after I printed a test cube.
These things have many uses for leveling things around the house.
Re: Trueing bed to towers proves quite difficult; Is it essential? December 11, 2015 05:17PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 13, 2015 01:45PM |
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etfrench
You don't need to measure the length of the diagonals, just verify their relative lengths. A story board will do this.
Re: Trueing bed to towers proves quite difficult; Is it essential? December 13, 2015 02:46PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 13, 2015 03:27PM |
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realthor
On a side note, I have a crazy idea: did you see how the Overlord is skinned with the aluminum extrusions? They are slid over the injection molded structure and 4 puny screws keep it in place. I personally don't believe they add to the stiffness of the frame much more than the rods themselves. [...]
Now my idea: strip the Overlord of these Aluminum extrusions and use them to build another Delta printer with them, Rep-Rap Style - one printer builds another one -. The channels can be used to bolt a linear rail like some Kossels do or go even wilder and have some sort of carriages made with some bearings riding the three channels to provide stability or even some PFTE/UHMWPE sliding blocks. Barebone bearings would be pretty loud I guess.
Re: Trueing bed to towers proves quite difficult; Is it essential? December 13, 2015 06:59PM |
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Re: Trueing bed to towers proves quite difficult; Is it essential? December 17, 2015 05:51PM |
Registered: 9 years ago Posts: 1,035 |
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dc42
So it sounds as though your delta frame is slightly larger at the top than at the bottom. Can you measure it to check this? Can you do anything about it? If not, then I suggest you adjust it so that the towers lean out by approximately equal amounts.
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etfrench
What was the result of using a story board to verify the distances between the towers?