DIY CNC

[paulp]

All the 3d models I've used are freely available from 1 of several sites I've contacted...

http://www.hepcomotion3dcad.com/Frameset.htm

This site has a lot of models but are pricey on their product range.

http://www.aluminium-profile.co.uk/acat ... ments.html

This site appears to be their main supplier and has a much better range. Cheaper as well.

http://www.automotioncomponents.co.uk/p ... -other.htm

This site has some rather nice bits and models in places. Its one of them I've been using for pricing.

http://www.rpmechatronics.co.uk/product ... otors.html

This site has a useful model of a NEMA 23 Stepper motor and some good prices on lead screws etc... I've been given some good quotes and advice from their technical guy.


Well I shall plod on researching and playing... I've found a few nice components and contacted a few people who seem willing to assist with components etc at a reasonable price. I look forward to your assistance when you have the Kits and p.Brain launched.

[paulp]

If you are interested, I can mail you the Inventor projects. Though I must warn you I am an amateur with it.

[Matt Denton]

If you are interested, I can mail you the Inventor projects.

Yes please!

You will probably notice I have moved this topic to the new Engineering/CNC category.

[paulp]

Aluminium Version

Was hoping that it would be a simple case of using thinner Aluminium rather than Acrylic but not quite that simple


By pajp at 2008-06-27

Still it should come in cheaper than some of those I've seen advertised.

[MetalSkullRobotics]

I found a handy pdf on my computer that helped me on the way with designing and building the CNC. I uploaded it to my site thinking you might want to have a look at it.

CNC Robotics Geoff Williams (55Mb)

[paulp]

Thanks for that MSR, I read through it and it has some interesting features and facts.

I was a bit worried about certain aspects of his build though. Some of the construction was a bit dodgy to say the least. If anything the document could be a bit off-putting as it seems to imply you need to know everyhing from Low-level logic circuits to arc-welding. In fact if you read closely, he tries absolutely everything.

Electronics-wise, I have no intention of re-inventing the wheel. Whatever I can come up with is readily available somewhere and at I price I couldnt match. I'll go down that route I think.

It does emphasise the one thing that is going to be difficult and that is accuracy.

The final product will only be as accurate as the machining put into its construction. I'm beginning to believe that I cannot achieve the degree of accuracy needed with home tools. At least not until I've made my first CNC machine then I can use that to make more.....

[cwiliam]

this is a great forum
great cad drawings !
I was wondering if it would help recomending another great forum which I also love

http://www.cnczone.com


a lot of diy cnc machines (also commercial type) Includes a variety of subjects from software to hardware



check it out

[paulp]

Yet another option for mounting linear bearings.

This method has the advantage of allowing the use of stock aluminium extrusions an greater flexibility for home alignment. Not so many precise holes to drill.

It has the disadvantage, as always, that these bearings are about £20 per axis more expensive. You also need to increase the overall width of each axis to allow for the size of the fittings.

Its a bit awkward to make out the sections so I've made the end clear.


By pajp at 2008-07-07

[paulp]

A better view with the end plate removed.




By pajp at 2008-07-07

[Matt Denton]

Looks like your really getting involved with this! I'm still bogged down with p.Brain manuals/code/design.. I wish I had time to play around with this project but got to keep focused.. you know what its like, the grass is always greener

P.S. Just added the latest version of the p.Brain-ds24 manual here. feedback welcome.