Vision Miner 22 IDEX V4 (Page 2 of 2)
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Originally Posted By -Obsessed-: HIPS dissolves in D-Limonene. Surprised you had adhesion problems. Mine always pop off super clean. It wont pop off quite as easy as PLA to PETG but its still pretty easy to pop off. I generally use a precision flat screwdriver to get a corner started and then it peels off clean. Depending on how the slicer did the interface, you should have nice crisp edges. Only reason I could see that could cause that is if you had an internal fillet as fillets are hard to get fully supported without literally interfacing every layer within the fillet. It was difficult to get a tool underneath the interface because it was in a deep pocket and I didn't have good access to the edges. Once I got it peeled up a little it came off without too much fuss. Anyway I forgot to set the HIPS shrinkage to the same value as the ABS so the shrinkage factor wasn't applied and my part came out too small.  I'm going to redo it with concentric pattern interface which should hopefully minimize the remnants. I'll have to order some of that limonene stuff. |
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Originally Posted By Blob: It was difficult to get a tool underneath the interface because it was in a deep pocket and I didn't have good access to the edges. Once I got it peeled up a little it came off without too much fuss. Anyway I forgot to set the HIPS shrinkage to the same value as the ABS so the shrinkage factor wasn't applied and my part came out too small. I'm going to redo it with concentric pattern interface which should hopefully minimize the remnants. I'll have to order some of that limonene stuff. Yeah my slicer puts a perimeter around the interface layer like a normal part would get. Never thought anything of it. You may consider getting a Cricut pick set. Can help getting into those tight spots. Wife doesnt know any better. Attached File |
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Starting to plan out the PEI sub plate. I have a sheet of 1/4" MIC6 aluminum plate that I'm going to waterjet to 374mm square (same size as the carbon fiber build plate) and machine some pockets for 5/8" x 0.125" N38SH magnets from McMaster. Rated up to 300F (150C). My plan is to machine the pockets to depth so that there's a 1mm gap between the magnet and PEI sheet, which according to a magnetic strength calculator should provide approximately 3-4 pounds of force per magnet. With 13 magnets I will have around 45 pounds of force in addition to the four screw downs in the corners. I can tap some holes next to the edges of the magnets which will allow me to secure them with some stainless M3 button head screws, this way they are replaceable and I won't have to fool with epoxy. Thoughts? Attached File Attached File |
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Im sure you dont want to hear it from me, but your calculations are significantly off. Probably not accounting for the PEI sheet reaching magnetic flux saturation long before the magnet stops offering more. You are going to be lucky to get 15 lbf total, and thats IF you use the gizmo dorks extra thick sheet. Otherwise you're probably looking at half that. 
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Originally Posted By -Obsessed-: Im sure you dont want to hear it from me, but your calculations are significantly off. Probably not accounting for the PEI sheet reaching magnetic flux saturation long before the magnet stops offering more. You are going to be lucky to get 15 lbf total, and thats IF you use the gizmo dorks extra thick sheet. Otherwise you're probably looking at half that. I didn't use the right sheet thickness. But McMcaster lists the magnet maximum strength as 10 pounds while the calculator I used is saying 7 pounds so idk. I'm just flying by the seat of my pants really. I think the magnets main purpose is to just make the wavy sheet sit flat against the plate though but I can easily add more. It's not my money after all.
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Originally Posted By Blob: I didn't use the right sheet thickness. But McMcaster lists the magnet maximum strength as 10 pounds while the calculator I used is saying 7 pounds so idk. I'm just flying by the seat of my pants really. I think the magnets main purpose is to just make the wavy sheet sit flat against the plate though but I can easily add more. It's not my money after all. Read up on magnetic flux capacity of thin sheets. Also pull strength vs distance is an inverse squared relationship so you drop strength very, very rapidly. Lastly some calculators are magnet on magnet whole others are magnet on steel or even magnet sandwiched between plates. General rule of thumb is to absorb the full magnetic field, the steel should be as thick as the magnet. Any less and the field bleeds out the back surface of the sheet. Also the 1mm air gap removes roughly 2/3 of the pull strength, vs 25%. I think best case, using a full thickness plate, you max at probably just under 3.4 lbf per magnet at a 1 mm gap. It scales roughly linearly with thickness of the plate so if you are using a 1mm plate, you will get 1 to 1.1 lbf each. |