80 Dollar, 60 minute Frame Build aka 80/60

Hardware
21

I believe there are 2 cup hooks replaced by 2 screws. I saw in an old post where someone used 2 bobbins as pulleys. @bar cound better answer this.

Thank you

22

I put together my frame based on the 80/60 design this weekend. Overall the build went well, but now that I went to put a sheet of plywood on it to cut my sled I realize the plywood I cut for the frame is warped fairly significantly. I thought we’d picked a fairly flat sheet for the frame, but I guess not. I can put a sheet on it, but mainly because all my sheets seem to have a similar warp to them.

I’m not sure if I should add some bracing to try to straighten it or just get some better plywood and replace the warped pieces.

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23

I chose to add bracing. Here in the Pacific Northwest, I find that plywood warps morte often than not. A warped sheet caused problems that went away when It was braced flat.

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24

There’s not a single flat sheet of plywood in my shed. They look nice and flat at the store because they are sitting flat-wise in a somewhat controlled environment, with other sheets stacked on top of it. Get it out in the real world and store it on edge and it’s warp city.

Brace up your backboard to get it as flat as possible and when you put your work piece on, clamp and/or screw it to the backboard.

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25

You can use the 80/60 outer skirt to mount more 2 x 4s vertically to pull a piece flatter. Is OSB more stable in your climate? If so you could use it for the outer skirt.

Thank you

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26

https://canada1.discourse-cdn.com/flex031/uploads/maslowcnc/original/2X/c/c029221f29fc7b1e75427a14aac8d5c49214edb9.MOVI put your build together today too bee and have the same problem, but I think I’ll add some extra braces in the corners to flatten it a bit.

27

Thanks for the Video. I will look at adding 45 degree corners as mounts.

I appreciate the input. How are you mounting your chains? The old way or the new way?

Thank you

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28

Im going to do it the new way. Do you have any pictures of your set up with all the hardware on it? I thought i read in another thread that you were considering adding another 2x4x10 to put the motors on so the chainswill be more parallel with the work surface when connected to the sled.

I have the linkage kit that ill be using with it too, so im trying to figure out how high ill need to make the riser blocks with this build too.

Thanks again for the manual you put together, it made building this pretty easy. Since its the only design with a skirt I think its the only one that realizes the true 4x8 workspace.

29

You are correct that it is the only design that has 100% access. I’m going back and forth between testing multiple designs and the original frame. I need to put together my top beam this week. I can try to get pictures up this weekend. I’m in between on which slack system to use.

Thank you

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