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There's only so much I can do since some things were on ebay but I'll tell you what I can.
Linear rails off ebay (the ones I used weren't designed for cnc so they weren't particularly straight but...

This thread is really old but I still want to talk. For $1500(plus software) you should be able to get a really nice machine(if you know where to buy). I don't know if you looked into building a...

Romanlini, my shaft coupling is a thust bearing and a shaft collar away from a double bearing support so I need to have a compliant coupling. I know what I'm going to do. I'm going to wait till I get...

I did some test with a set screw collar on a junk piece of 1/4 acme screw I had which had a minimum hardness of Rockwell B70. If I put the set screw in tightly without a flat you could easily get it...

You've got a lot to do. First off we need details. Budget, cutting speed, what's it going to cut, what accuracy/repeatability/rigidity do you want? Here's a cheap driver that you pug the motors...

you recommended the oldham couplings but are they good for cnc applications? They cheaper for the same loading capabilities and have superior misalignment properties. I just don't see how they can't...

From first looks that site is freaking awesome. It may not be much cheaper but I can get exactly what I want. What's with the 6 day waiting period? How long and how much does it usually take to...

yeah i don't want that. are you saying this just isn't a good idea? Is there anyway to make those cheap spider couplings close to or essentially backlash free? What about bellows couplings, do they...

Are the motor shafts or lead screw fracturing? I'm using acme screws made of 1018 with brinell hardness of 126 to 180. I don't know if that's hard or easy to crack but that's what they are. Is this...

I found some brass couplings on probotix which would save me $40. They use set screws and I'm not very fond of those. Has anyone had any experience with set screw couplings and rigid couplings? Since...

I didn't know they would break. I figure they're only backlash free if both shafts are axially fixed allowing zero wind up. But what about the ones that aren't helical? I think those may actually be...

I was looking at some couplings on keling and for three plus shipping the cost would be $83. I like those because I know they'll have zero backlash. I looked at some helical couplings and those would...

I don't know what it's called but it has a pretty distinct look with some weird connector in the middle. I found it here (CNC Stepper Motor and Components, Keling Technology Inc, USA) and it's 1/4...

The water would be straight but I'd also have to get everything level too!! I just don't see that being a practical or easy solution. Do granite blocks have little pores in them that would ruin...

I asked a close friend for his opinion on this matter and he recommended pretty much what bobgerman recommended. I will be using shims since they're pretty cheap and he brought to my attention that...

First off I don't think I have any way of machining steel to any tolerances. I feel like scraping the metal would be ridiculously slow and couldn't be done if the metal isn't already straight to...

Well, I'm not sure if people of clear on what I'm saying so I'll post some pics. In the end, if i have to i'll use mic-6 but that's only if i can't get what i need from 6061-t6511. As you can see...

Liquid metal still just sounds like a pain and i don't know if it'd be worth the cost of testing. Epoxy would probably work if you slotted a piece of the metal so it wouldn't move otherwise it...

Yanko that sounds cool since it'd prevent the bolts from slipping and messing with the accuracy but i think i'll stick with just bolts. WildWestPat, i think the parts do have to be raised in temp. to...

If the computer could adjust without with some reference points I would likely just use that because even though it's not as good and will be slightly inaccurate and leave "straight" lines less...

Vegipete, both are probably possible through software but on a 3 axis router if the z isn't square you can never have a square part(a cube would have parallel but not perpendicular sides). With a 5...

So it sounds like it may be possible. I don't care too much about how straight it is when it comes as long as it's good enough to where I can make it straight. To give an idea of the parts the parts...

I've looked at that stuff but it's about 4 times as expensive and it's not even flat on the sides I care about. It needs to be flat on the skinny side meaning I would still have to machine it meaning...

I was thinking about a shoulder to press it against but since the rail looks extruded with a precision ground inner raceway I can't be sure that they line up perfectly so I will use a reference edge...

I have some linear rail that aren't technically made for precise linear movement but from my measurements and the data sheets they seem to be capable of linear movement with a max deviation from...

What would you consider acceptable? with xy squareness I'll get it the best I can but adjusting the z's will be harder because of just how it'd have to be done and I don't want to fuss over trivial...

I've been looking at SpeedyMetals.com for finding the price for the aluminum for building my cnc router. I'm going to be using a lot of aluminum and am aiming for a very precise machine with...

I plan to do a lot of aluminum work with my diy router if that has any effect on responses. I'm designing my router to be adjustable for the squareness of xy/yz/xz but I'm looking for values for...

Thanks for the response. If your data is right it seems like I have nothing to worry about. I had to read those several times to understand the units you were using. On your first link I think with...

Clearly no one wants to read a question that long so here are the simplified questions.

Question 1-would it be worth the money to increase the cutting size from 15x15 to 15x20 or is 15x15 good...