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Post by Big Man Black T-Shirt(Patrick) on Apr 20, 2017 1:27:07 GMT
OK, now it's time to mate the Y axis bed and the X-Z side rails. I've placed the two together and want to clear up a few questions before I begin bolting anything together. The bed has a 2-3mm gap at the front right and rear left, relevant to the front and rear pieces of MDF, respectively. Is that being out of square something that I definitely need to square up before I proceed? (I think it is but I wanted to ask before I invested time into it.) Thanks! Attachments:
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Post by Derek the Admin on Apr 20, 2017 1:59:54 GMT
It won't actually affect performance but it's not "right". There are two things that cause what you are showing there: 1. Bed is mounted crooked to the Y axis bearing plates. Solution is to back those mounting screws (the wood screws) and turn the bed to correct the gap then retighten. There is enough free fit in the holes the wood screws go through to allow some adjustment. 2. The "clock direction" of the V wheels. Solution is to tighten V wheels in "canceling" directions. The V wheels are adjusted by eccentrics that control how closeor far the bearing is from the hole center. It's possible ton inadvertently turn them in such a way that throws it out of kilter. Even if it's a bit out due to this you can probably do the solution suggested in #1 and get pretty close.
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Post by Big Man Black T-Shirt(Patrick) on Apr 20, 2017 4:00:02 GMT
Ah, got it. I'll flip it over and loosen the screws and see if I can true it up.
"Clock direction" is a good way to describe the V wheels orientation, I knew exactly what you meant the second I read it!
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Post by Big Man Black T-Shirt(Patrick) on Apr 20, 2017 21:39:40 GMT
Solution #1 was a no-go. There is no play when I loosen the wood screws. The heads of the bolts that fit into the pocket cut into the back of the bed are so close it doesn't allow it to wiggle any. I now remember that being the case from when I first installed the plates.
I tried adjusting the eccentrics but that just added or relieved tension to the rail, it didn't do anything to cock the bed around to a more square position.
If it's not going to affect anything I won't worry with it anymore.
I've been thinking of how it might affect the cut on a project. Imagining it, though, is proving to be tough!
As long as the movement of the bed is consistent it won't matter, is that the thinking?
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Post by Big Man Black T-Shirt(Patrick) on Apr 20, 2017 22:08:47 GMT
I just set the X-Z gantry assembly down astride the Y-table assembly and checked how the corners were lining up. The left side is fine but the right is way off. Is this acceptable and will the corner brackets pull it back into shape or is this something I need to be concerned about? Thanks!
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Post by Derek the Admin on Apr 20, 2017 23:37:41 GMT
Corner brackets will get that where it needs to be. May want to youse a couple long pressure clamps or 90 degree clampsif ya got them to help hold it where it needs to be while you install the brackets
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Post by Big Man Black T-Shirt(Patrick) on Apr 20, 2017 23:53:47 GMT
OK. Given this and the 3mm gap I mentioned earlier, should I be concerned or will it most likely be OK as far as cutting materials consistently?
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Post by Derek the Admin on Apr 21, 2017 1:26:49 GMT
You'll be fine. You want to be sure that you true things up when you attach the corner brackets because that doesn't need to be out of whack or you will experience out of square cuts.
You might want to loosen the tap screws on the gantry rail (X rail) a little bit to kind of unbind things a little bit when you set the side frames to the front and rear frames. Once you get all that squared up you can retighten the gantry rail, making sure that its not cocked on way or the other.
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Post by Big Man Black T-Shirt(Patrick) on Apr 21, 2017 20:35:05 GMT
So I need to use a square on the inside of the corners and try to get all 4 corners as square as possible. I should ignore the outside of the MDF corners, there may be some overlap but as long as the insides of the corners are square, that's what really matters, correct?
I apologize for all the questions, I'm a electronics nerd, not a tape measure, square using builder!
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Post by Derek the Admin on Apr 21, 2017 21:02:43 GMT
Well you do want outsides to flush up and it should be square on the outside if its square on the inside. You don't want any overlap where the frames meet up.
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Post by Big Man Black T-Shirt(Patrick) on Apr 21, 2017 21:20:20 GMT
OK, I removed the X-Z gantry assembly completely and then flipped the frame up on its end and worked from the bottom. Using a square and trying to get the outsides to line up I was able to get it all pretty close. not perfectly square but off by maybe 1mm, and the outsides of the MDF corners line up pretty well.
I'm going to call that square until I experience problems with my cuts not being square.
I'll let this thread die now, seeing as I've strayed from the original subject of the thread!
Thanks for everyone's input.
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