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You might get a granite plate at Tilgear for reasonable money.
Your design makes for a very rigid gantry and it highlights something I've been thinking about. Say you wanted a height under the...

[Please note this post is not quite finished - I will be editing it in the next few days to include costings among other things]

Just over two years ago, when I made the steel frame for my router...

Hi Andy, good luck with your move down under, I hope it suits you well. I don't understand the comment about bed size being 12200x800. I have always understood that the system 48 (then name changed...

If it's close enough then I would say definitely worth a visit, as Stuart says the frame is a serious bit of kit so think about that for lifting & transporting. From the description the guy has...

I would guess about 600 to 800 uk pounds if its ok. I paid about 1400 for my one (its got a bed double the depth) but have put new motors and re leveled it. Its probably most useful for its bed its...

If your space challenged then it's a no brainier to me go vertical. There's no down sides only gains, space being the biggest gain.
My machine mainly (99%) cuts aluminium and other than the space...

For every material there is an optimal speed (feedrate) at which to cut it and a minimum speed. Optimal is hard to define - it could mean the speed which obtains the best tool life, the highest...

Fück the carbide.
They always break the tips off and tease you by nearly doing the job before doing so.
Carbide for anyone that doesn't know is a sintered powder, pressed up and heated so no matter...

Geoffrey, if you click "Go Advanced" in the bottom right corner of the "Quick Reply" box, you get some extra options, one of which is "Add Attachment". the icon looks like a sheet of paper with a...

Looked at the pic and the steps are out on the setup.
You probably don't know what that means which proves you are thick but no sweat for a Welshman living in OZ we all feel sorry for you.

OK we...

http://www.youtube.com/watch?v=I8WVR3zAxNs

Here's the video on 2 sided parts. Its pretty lacking and that's probably because I didn't plan anything before picking up my phone and recording....

O cmon you didnt really think i'd leave you hanging like that did you?

A quick fix for this has been to change the type of editor the forum use's for messages, it was set to "Enhanced Interface -...

If the inertia of the system is reduced, less torque is required to achieve a certain acceleration. To reduce the inertia you can either make the gantry lighter, or reduce the mass/size of the...

I guess not everyone on this forum is a bitter / negative old tool...

JAZZ is completely correct there. What takes time and really makes code generation easy is setting up your CAM program properly and making sure the post processor is set up for best practices on the...

Just be careful with the naming/packages ....the program I was speaking of earlier is called CNC-USB, rather confusingly I believe there's also a product out there called USB-CNC...I know zilch...

I have used a variety of B.O.B's and currently use a PMDX-126 with a ESS attached. This has gotten rid of noise and signal issues and allows for the repeatability and acceleration that allows me to...

Yes it should be. I've done it by cutting a pocket for the motor into 1/2" aluminium, so the surface the motor actually rests on is only about 4mm thick, but the border is 12.7mm thick. This provides...

It depends how fast you need the machine to go. If you're happy with 6m/min, then as irving has said 1500mm is OK. If you need more you either have to use more bearings, use a higher pitch screw,...

16mm @ 1500mm long, the critical speed if fixed one end and supported at the other is around 600rpm

http://www.nookindustries.com/ball/BallCalculators.cfm

Thought I'd post my first findings on a Lead shine closed loop digital stepper system I have had the chance to mess with courtesy of Gary at Zapp Automation. . . Cheers.

I've actually had this...

Yeah I ordered the wrong size aluminium plate!

To make it easier to square you should mill a shallow slot into the back of the Y-carriage plate which holds the Z-axis bearings. This can then align...

They go through ali like butter. Ive seen the adapters on ebay before, or you can make one like mine on a lathe for nothing.

7004

Voltage on relay contacts is generally not important, its the current carrying capacity. If you need more current then you wire the contacts in parallel. The reason why contacts have a lower DC...

Ok first yes it's fine to combine different motors on same machine, at worst it may mean having more than one PSU if they are so different.

Regards Mach3 then it can read the encoders to display...