Side by side I think it’s noticable also I’ve heard, LCV have raised centers and SCVs don’t.I find it very hard, if near impossible, to tell between the LCV and SCV. Is there something obvious that I'm not perceiving?
Side by side I think it’s noticable also I’ve heard, LCV have raised centers and SCVs don’t.I find it very hard, if near impossible, to tell between the LCV and SCV. Is there something obvious that I'm not perceiving?
Side by side I think it’s noticable also I’ve heard, LCV have raised centers and SCVs don’t.
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No - you would just need to adjust the depth you mill ~0.5mm deeperSo you have to base your z axis starting point on the face of the chip?
Update on your CNC milling progress please!
Thanks for the update! That is awesome progress! That circle mill with the larger bit went by fast! You could easily do a rack at a time....
Thanks! It's fun. I went big and got the XXL. The standard was just too small and the difference between the XL and the XXL was only $200. But you need a lot of room. That work bench I built is 4' x 4'.That's awesome @arch3r! I've been wanting to get a cnc setup for a while now. Looks like fun. Which size shapeoko is that?
Hahahaha! Nailed itAsked my kids what I should cut and this is what they came up with...
But it's not just the waste board being off. But the chips are also off. Milling used chips when they are all not the exact same height just adds to the possibility of your mill depth being off.Get a scrap board the size of your jig plus a little bigger for clamping your jig.. Attach it to your table. Mill the top of the board flat with the CNC. Attach the jig to the board. You should be pretty darn good with your depths then.
He said that his table is 1 - 1.5mm off. This will take care of his machine table being off. Without a good foundation any milling to a decent depth is hopeless. Then he can measure the chips and sort them according to the thickness. Easy enough to do and then he should have very little problem getting good results.But it's not just the waste board being off. But the chips are also off. Milling used chips when they are all not the exact same height just adds to the possibility of your mill depth being off.
He already milled the HDPE pocket for each chip, so he should have the same effect that way. The waste board also looks milled on the close up picturesHe said that his table is 1 - 1.5mm off. This will take care of his machine table being off. Without a good foundation any milling to a decent depth is hopeless. Then he can measure the chips and sort them according to the thickness. Easy enough to do and then he should have very little problem getting good results.
I saw that but I wasn't sure if he milled it in place or not. If it was milled in place and not moved, then the depth differences might just be due to the resolution on the servos, but that wouldn't account for the taper in the milled pockets. That's why I assumed that the fixture was milled and then moved. I suggested using a scrap piece so that you can make it parallel to the machine movement each time you want to mill some chips. I guess we'll have to wait for Arch3r to chime in.He already milled the HDPE pocket for each chip, so he should have the same effect that way. The waste board also looks milled on the close up pictures
got a dial test indicator? HDPE is a bit softer than I would personally use but you can check the pocket depths with a DTI attached to your spindleAnd i don't know why the base is off. After squaring and leveling the shit out of it, i milled flat the entire waste board. Even if the rails are not exactly level from side to side, after leveling the water board, it should be the exact height relative to the spindle across the entire thing, right? But still nope, still a bit off. Annoys the fuck out of me. Can't seem to figure out where the error is coming from??
You're right - if you milled the entire surface, it should be parallel to your machine movement. I've never seen one of these machines in person so I can't really tell you where to look. Most often error like this is in the accuracy of the servos or the tightness/looseness of the ways.And i don't know why the base is off. After squaring and leveling the shit out of it, i milled flat the entire waste board. Even if the rails are not exactly level from side to side, after leveling the water board, it should be the exact height relative to the spindle across the entire thing, right? But still nope, still a bit off. Annoys the fuck out of me. Can't seem to figure out where the error is coming from??
Ok, it's been a while so here's the update.
Well I have learned alot over the last month or so. Learned that I don't know nearly as much as I think I do. And that watching you tube video's and reading blogs does not make you an expert an anything.
I have had many trials and errors trying to make the right jig and setup to mill efficiently and consistently.
First I created a jig that would hold 49 chips (7x7).
https://photos.app.goo.gl/H4wLhewZRdHRuM9q6
View attachment 299259
Toss some chips in and give it a whirl.
https://photos.app.goo.gl/yu6zNm7En4kjWj4m8
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If you watch the video, you'll see the the second chip that gets milled moves a bit. That is a no-no and I need to correct that. Also you'll see that the last two chips don't get milled at all. This is because not all chips are the same depth and my CNC is only so accurate. And when we are talking 0.25mm, any little bit off is a lot.
So I took some time off from the CNC, ordered some more toys for it. I got an air compressor to help blow out the dust created.
View attachment 299268
And I got a dust boot for the CNC, so help collect the dust as its milling.
View attachment 299269
With the new toys I went back to making another smaller jig ( 4x5 ) with a top plate to help hold the chips in pace and keep them from spinning.
View attachment 299270
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That worked fine, but making it out of MFD was always only for a prototype. Plus, the layout was inefficient.
I could fit 5x5 in a smaller foot print. Which is what I did, but this time I was using HDPE ( think plastic cutting board material ).
The screw holes between each chip lines up exactly with the holes in my wasteboard so I can lock the jig down from any position.
View attachment 299272
And the cap with the same screw holes. Allows me to make sure it on and tight against each and every chip. No popping out and no spinning.
View attachment 299273
Problem is, look at the bottom row. Milling depth is off and not level. Did some testing and across the distance of my CNC, I'm off about 1-1.5mm. No big deal if I'm milling a sigh of something like that. But when my tolerances are 0.25mm, that difference is 400%-600% off. So now I'm in the process to try and level and square the machine yet again. If not, then I'll need to make a smaller jig and mill less at a time to reduce that discrepancy.
So there you have it. Still zeroing in on the optimal milling setup. But it's getting there.
Challenge accepted.I'm pretty sure you could collect all that Paulson dust and sell it here. There have got to be people here who would pay good money to do a line of THC.