BOOTSTRAPPY WORKSHOP : MK2 Epoxy-Sand Machine-Base P2
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- เผยแพร่เมื่อ 6 พ.ย. 2022
- How to Build Epoxy Granite Machine Base - www.youtube.com/watch?v=4aBVA...
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Nice build 👌
For stability there shoud be more bracing in vertical axis, like beam struses.
Every time when its moved it must be leveled to zero since it flexes.
Even cast iron or carbon fiber sags.
Thats why there are machinist levels...
I'm gonna subscribe, because I want to see this finished.
Following, hope will see more updates on the project.
Trust me, the next update is incoming shortly.
I started watching this and thought "OMG what a shit show, that base had no supports before the pour etc" I stuck around and continued to watch, you pulled it together really well, so i take my thought back. Nice one Sir!!
Thank you, but it remains to be seen if it's gonna work. Planning on having the machine working by end of Summer 2024.
It looks bowed! 😁 im sure its the lens curvature. Great work 👍👍
Watch to the end.
Could I trouble you for some information on ratios and volumes? Specifically, it looks like you used a relatively dry mix, what was the resin ratio to aggregate? Is sand the only aggregate you used? Im looking at building a machine base very similar to this, and that information would help me make a decision between epoxy granite and ultra high performance concrete.
All mixing information is in part 1. However I will say that the improvised rebar that I used was not sufficient. In future design iterations I will be used welded steel tubing for stiffness. I am planning to one day build these out a material nobody would believe and the epoxy is a placeholder for that, but if you're only building one I would recommend you go with concrete.
@@bootstrappyworkshop8367Try basalt or carbon fiber. Basalt fiber is much cheaper and superior even to carbon ones.
12mm on Ebay, some 25 usd per kilo.
My estimate is 6% in mix, plus rebar since machine is large but there must be TWO ROWS of rebar horisontal axis, one just flexes, then they take on the load. Use slow epoxy since its bit hard for packing whit fibers, first mix epoxy whit sand than ad fibers.
My mix is 20% epoxy, 6% fiber and sand.
You can reinforce this table by gluing steel I beams under it. Use low grit sandpaper on beams and epoxy botom. First degrease surfaces, work whit clean gloves not to oil up surfaces.
You probably should not have put the feet on the ends like that. The 'levelling feet' should be about 1/4 to 1/3 from the ends. Then there is not so much of a span in the middle and the overhang on the sides will pull up the weight in the middle. Also put 1 foot in the center back, to have 3 point support. Then 2 on either side of that to support it once levelled.
I would take inspiration from how large granite plates are supported (same as I described above).
Curious to see where this will go (I checked you other video's, you don't seem to have posted a video of the finished CNC yet).
I have a day job that eats up most of my energy. I am hoping to have this actually running and making chips by Spring.
The problem is something like this isn't nearly as rigid as a granite surface plate and will probably be prone to sags no matter where the legs are. In hindsight perhaps a welded steel rigid frame could've been cast in with the bottom of the steel showing or protruding to mount the legs to so everything is supported strongly
Subscribed, Liked, and rang the "Bell".
To paraphrase David Suchet as Hercule Poirot - "I await (the next episode) with the breath which is bated."
I'm enjoying the build immensely, you (and Adam Bender) have me wanting to build my own. Thanks! ( I think. :^) )
Unfortunately, it will have to wait, as I plan to move and would rather not have to ship it. I can wait until I'm at the new location.
A couple questions. Obviously, I don't know what your spindle arrangement will be, but would it have been possible to wait until it was up and running to level the surface, cut the T-slots, and expose the 56 M8 nuts? Leaving polishing the surface for you to do?
RE: Spindle
I can't give it away exactly because this is not going to be a direct route to a finished machine. It's going to be a winding meandering road as the machine is designed, redesigned, and fabricated. And then fabricated again because I missed something in CAD.
As for level the epoxy was picked for versatility. I CAN go ahead surface it because there is a lot of tabletop epoxy to cut through before I hit the sand, but I am going to try and tram the spindle in to the current top first. You'll see, promise. Also, the spindle CANNOT cut the entire bed, as there should end up being a few inches on either side where the spindle just physically cannot go, which would leave a ledge. It dawned on me that I should have made the sides 45 degree slopes instead of 90 specifically for this problem, but it was too late once the epoxy was mixed.
This is a prototype, so I expect to mistakes that can be corrected in future versions.
3:50 The word you're looking for is "screed", not "skreet".