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I am curious if anyone has experience ordering clone linear rails from aliexpress? One particular seller I looking at is CNA Mechanical Parts Store...

I am curious about this too.

So I am at college and at my university I have unlimited free access to materials, most of which is a ton of aluminum stock and steel, as well as water jet, CNC milling machines and very large...

Im thinking of just redesigning the z, i want to add v bearings to get rid of those pipes to decrease weigjt and it will keep the router in closer to the gantry beam which will decrease deflection....

im talking about not using the hobbycnc at all

its connected basically the way that is in the plans. I have this piece connected securely onto that block of wood which holds the linear pipes apart and is held in there from the force of the two...

so is the bit a dud? I think ive only used it 5 times, id hate to have to waste it. this wood im using in the picture splinters worse than say birch plywood of the same thickness, and it was...

The router itself flexes in its spot, which allows a ton of deflection, when you say "pull with all your might" im doing a fration of that. It seems the wood block between the two pipes twists a bit...

Spintering is the least of my worries rn, because i can sand all that off and still get perfect edge quality, i just want the cutting to be percise

Oops! Well this is a brand new bit, used it only a couple times, so i doubt its already dull. Its black because my dad tried using it and he is clueless with it and left it spinning in the wood so it...

https://youtu.be/Sw7CPsIBENA
watch the video and watch when it makes second pass, the little jolt, then it cuts extra material seen when its on left side.

I took two passes on 3/16 wood
bit= whiteside 1/8th downcut
speed= 30 imp (yeah its slow)
RMP = 16,500

Circles are pretty good for the most part, so there cant be much backlash. The...

okay so wow, turns out my pulley connected to my stepper was loose and was slipping a ton! HAHA im suprised I didnt break the bit. I tightened it up and it is cutting thousand times better, but now...

I see you are working or have worked on a new Z axis? I want to burn mine because its so damn flimsy. Any tips? I want to try to make it without using v-groove bearings

Since you eliminated the washers under the linear rods, how to you level the machine on the x axis?

So I got my machine dialed in pretty well, ordered some downcut bits and cut projects out on birch plywood and they came out great. I didnt use it a couple days and now I cant get a decent cut at...

Do mach3 smooth steppers or motion controllers require a stepper driver for each motor? Im running a hobby cnc board that was 45$ and its the size of a small breakout board and doesnt require...

Thats a little passive aggressive

Im thinking about scraping the wooden y gantry and using an extruded aluminum c-channel from open builds to make the linear actuator. This should give me the most compact and sturdy design so that my...

I phrased that poorly. No so I have two bearings on each end of the lead screw supporting it, and a collar clamp on the end opposite to the stepper. However On the right side I connected the lead...

I found significant backlash in y-axis due to helical coupler with no support so it could literally expand. Also the gear was cut in two passes, which the visble line is the spot between the two...

Thanks for the advice. I will purchase a downcut bit and hopefully it helps. Also I think I can rule out skipping steps (not sure if this test can indicate it) But when I slowed it down and cut a...

The reason I ruled out backlash and the slop you are talking about is because when I run the machine slowly, the cuts come out perfectly accurate, but when I increase the speed something happens and...

To start off, here is a link to the machine I recently built http://www.cnczone.com/forums/diy-cnc-router-table-machines/264472-solsylva-25x25-cnc-build-log.html I should mention also that the only...

On mine i am using a brand new white side upcut bit and the surface of my peices just fuzes up on one side and looks really nasty even though it scrapes right off. I am using a random direction,...

i went ahead and did the double nut thing and it took about 8 hours to set it all up, but i finally have a perfectly level machine

Thanks for the input. Could you share some pictures of how you have the screws and tabletop setup?

I was doing some tests and found out the left side of my machine is 1/8 inch higher, so cuts along the Y-axis will not be flat. Im adding aluminum angle to help prevent the washers from sinking in so...

[QUOTE=avengine;1742308]I went to a show and they try to cut a circle on the cheap foamboard that i ask them to cut, it is a Epilog co2 laser machine 70W power, a bit of burn mark on the edge and...

First 2 cuts, both with v-engrave bit

the pattern looks like the wood was perfectly flat so it didnt go deep enough on the far side where I zeroed it.