Maslow 4 Max size for frame? Cutting edge to edge

So I have a wall in my garage where I would like to put the frame. I’m trying to find out what is the best size for edge to edge cutting.

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Would you believe me if I said that in the 39 minutes since you posted that question I made a YouTube video just for you to answer that exact question?

Bar wrote:

Would you believe me if I said that in the 39 minutes since you posted that question I made a YouTube video just for you to answer that exact question?

https://www.youtube.com/watch?v=7X5S4LkapX0

note that the tool shown doesn’t account for all belt angle issues (opposite
belt angle)

David Lang

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Bar wrote:

Would you believe me if I said that in the 39 minutes since you posted that question I made a YouTube video just for you to answer that exact question?

https://www.youtube.com/watch?v=7X5S4LkapX0

This is the video from last week, did you mean a new link?

David Lang

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It does now! I fixed it after you pointed that out :grinning:

Yeah, I was joking about making a video on the spot. The video just happens to answer that question :stuck_out_tongue:

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Bar wrote:

It does now! I fixed it after you pointed that out :grinning:

yep, looks good (I posted before I realized it was last week’s video). If you
want to add a gradient, look at the latest version of my calculator and it shows
curves for every degree the angle exceeds the limits. It also has a table on it
giving an indication of how much error you get for each band.

This is why I’m so interested in the people doing the ‘clipped ears’
configuration, that little extra angle makes a fairly significant difference in
the corners.

David Lang

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At some point we need to compare notes, our two calculators show significantly
different curves for the adjacent belt limits. you show them sticking much
further in to the work area than I do.

David Lang

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I think what we really need is real world testing to see which is a better representation of what’s going on :stuck_out_tongue:

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Bar wrote:

I think what we really need is real world testing to see which is a better
representation of what’s going on :stuck_out_tongue:

True, but with so many variables, it’s going to be hard to know exactly what’s
what. Is there a github repo for this tool? I can look in the code and compare
it to my math

David Lang

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There sure is!

Pull requests are very welcome GitHub - MaslowCNC/Layout-Simulator

Based on Bar’s calculator, I’m building a two part frame 3.2M x 4M as that shows green for the whole board. Although I just checked it again and the calcs may have changed as the corners are orange.

Bill Walker wrote:

Based on Bar’s calculator, I’m building a two part frame 3.2M x 4M as that
shows green for the whole board. Although I just checked it again and the
calcs may have changed as the corners are orange.

They did change, there was a limit that Bar didn’t think of initially.

David Lang

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But also keep in mind that I do most of my cutting on a 10’x7’ frame that absolutely runs into the orange areas. It’s not ideal, but it’s not the end of the world.

Bugger, ah well. I’ve cut the timber already :slight_smile:

Bar uses a smaller frame in his office, just check and see if work in the
corners is producing errors that you can notice.

David Lang

One has to wonder - if in the orange area, how large will any deviations from the g-code be? Are we talking sub-millimeter, 2-4 millimeter or more?

Rolf wrote:

One has to wonder - if in the orange area, how large will any deviations from
the g-code be? Are we talking sub-millimeter, 2-4 millimeter or more?

The short answer is ‘it depends’ :slight_smile:

On my calculator, which is only looking at angles, nothing else
http://lang.hm/maslow/maslow4_frame.html

I have lines outside of the green area. Each line is the belt being out of line
from the arm by 1 degree more than the prior line.

The shorter the belt, the larger the error will be, but if you are supposed to
have 1000mm from the spindle to the anchor (belt + arm), here is a table of how
much error you will have for each 1 degree of misalignment

if the belt + arm is supposed to be 1m long
angle effective length
1 999.98
2 999.921
3 999.822
4 999.684
5 999.507
6 999.29
7 999.034
8 998.738
9 998.403
10 998.029

so a small error you probably won’t notice.

As I see it, this is most critical during calibration, because you are trying to
measure where the anchors are, and if you get that wrong, it will then cascade
into all your future work.

David Lang

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I’ve been testing this: X and Y off by 1%

Had an issue where the cut was off by about 7mm near the edges on the X axis which really screwed my project up. When testing I was seeing a skew up to 10mm, but after modifying the machine, frame, and tuning I got it down to 2mm. Have some more work to do before I can run another cut and test with a real example, but I’m optimistic.

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