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  1. Update: I bought the "blue Lowes" foam, which...

    Update:

    I bought the "blue Lowes" foam, which I assume is Dow Tuff-R because that's the only blue foam board they sell, and the results were disappointing.

    I cut 1/16th of a medallion.
    1/4"...
  2. Do you have pictures you can share? What bits,...

    Do you have pictures you can share? What bits, feeds and speeds do you use? I think I need to buy a larger ballnose, the 1/8" will take over 6 hours with a profile path. Maybe I need a flute path...
  3. Super Tuff-R is 25 PSI and says it's density is...

    Super Tuff-R is 25 PSI and says it's density is 2pcf. (So a sheet should weigh 10.66 lbs, but the sheet weighs "12.16lb" according to HD...)

    Formular 250 is 25 PSI, no density given, but the sheet...
  4. I'm a little concerned about the weight of a 34"...

    I'm a little concerned about the weight of a 34" x 34" x 2" MDF sandwich. Solid plaster is probably lighter. Also the last time I tried to CNC a simple molding out of wood it took hours, so I suspect...
  5. Thank you everyone for your help! I will...

    Thank you everyone for your help! I will experiment with shellac and epoxy and try those tool settings.

    It hadn't occurred to me there were different PSI strengths of foam. One of the Lowes'...
  6. Foam or other printable materiel for ceiling medallions?

    I have a large ceiling medallion I want to copy, what is good paintable material to use? I've read suggestions to use "Lowes foam" which I assume means Kingspan Insulation foam. Is that good? Is it...
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    LOL, yes, more good points! I've been using MDF...

    LOL, yes, more good points! I've been using MDF so much I forgot trees don't grow in perfect rectangles.

    Don't worry, I won't use a bit with a bearing and damage any bags...
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    I think I'm looking at a hot water base board...

    I think I'm looking at a hot water base board radiator, is that right? And you want to replace the covers? If so, they aren't all $100 per 4 ft, you can get them for 1/2 or 1/4 as much depending on...
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    Oooooooooooooooooooh I completely forgot about...

    Oooooooooooooooooooh I completely forgot about the bearing on it, very good point! The bit you linked is so cheap I'll buy that if I end up using the CNC rather than grinding down my old bit, thank...
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    Can I use router bits in a shop bot?

    I have to make a ton of balusters, each with 4 chamfers 1-3/6 inch wide and deep. Can I use a big router bit in the shop bot?

    I've used this bit on my router:
    "uxcell 1/2 Inch x 1-1/2 Inch...
  11. I think my estimate was optimistic... I looked...

    I think my estimate was optimistic...

    I looked into router bits but could only figure out how to do half of it. But the longer I sit here the more I question doing it this way. I could 3d carve...
  12. I made the center trench about 1/32 deep. I tried...

    I made the center trench about 1/32 deep. I tried 4% and 4 IPS, it was so slow I could die.

    So I started over at 4% and 6 IPS. (I wanted to stay low on the step over just to not stress the bit.)...
  13. That's great, thank you! So you think I should...

    That's great, thank you! So you think I should stick to 3 IPS? What step over percentage did you use?

    I'm going to try running this today.
  14. I set the speed to 4 IPS pretty much randomly....

    I set the speed to 4 IPS pretty much randomly. The ShopBot speed sheets recommend 1.8-3 IPS and cutting 1xD. But I'm cutting up to 12xD but with only a 6% step over, so can I go faster? Even full...
  15. Doh! It's the makerspace version so I thought I...

    Doh! It's the makerspace version so I thought I could share it, but maybe I can only share it with the same makerspace version. That would make sense...

    Here is a screenshot of the molding profile...
  16. Ok I think I attached it.

    Ok I think I attached it.
  17. Thanks for the info and presentation! So I...

    Thanks for the info and presentation!

    So I made a new bit and entered the stats for the 1/8 tapered bit, including a cutting depth of 1.5 inches, saved, and... now Vetric has completely deleted...
  18. I'm using Vcarve pro (free trial and makerspace...

    I'm using Vcarve pro (free trial and makerspace editions) and a ShopBot Buddy.
  19. I'm using the molding tool path. Tried with and...

    I'm using the molding tool path. Tried with and without a clearing pass.

    That presentation is enlightening. So he's saying I should skip a clearing pass, just use a 1/8 ball end, and cut the full...
  20. 17+ hours to cut a strip of molding... any advice on bits?

    I'm replicating a "classic cove and bead" molding that is about 3 inches tall, 1.5" thick, 48" long, and I'm cutting 2 of them out of a 48" white pine 2x8. (I'll then chop them up and use them as...
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    If the PC is grounded to 1 rod, and the CNC...

    If the PC is grounded to 1 rod, and the CNC machine is grounded to a different rod, current can run through the commutation cable between the PC and CNC, and neither machine may be designed to handle...
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    That's a lot of circles. Naturally the CnC...

    That's a lot of circles. Naturally the CnC machine is getting bored and drawing outside the lines; give it a more complex shape now and then to keep it happy.

    My initial thought was dust buildup...
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    That's a good idea about a painted cloth or...

    That's a good idea about a painted cloth or screen! I'l run it by my fiancee. As long as it's cleanable -- I fear how much dust and car hair could get caught in it.

    The current grille "color" is a...
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    2 or 3 layer Radiator Grille

    I built a bench around the radiator in the kitchen and made doors to match the cabinets. The plan was to put a diamond grille and screen in the doors to allow airflow and to reflect the pattern of...
  25. You assume correctly, on all counts. That's part...

    You assume correctly, on all counts. That's part of why I was curious if making a 3D shape was worth the learning curve.

    Martin, Chuck,

    So I did the math: 8 layers of half-flute pieces each 0.5...
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