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30862

This is the PSU, the rest would need some considerable finding and sorting out.

The spindle speed starts with a reflective sensor looking up at the bottom of the front pulley and connects...

I used to say that 200 full steps per rev was fine for 1.7"motors, possibly okay for 2.3" but much too far for 3.4".

I used to suggest that you should use a much smaller motor for the Z axis and...

I am a bit out of touch, what is good in stepping motors these days? Have they improved?

Robin

29263

If you are cutting steel do not use one requiring a magnet.

The detector detects a passing object so it cannot be crushed if it fails.

£370 worth of Japanese stepper technology arrived on Tuesday and I am still fondling it. I get a stiffy from just reading the spec sheets :love-struck:

If it is always the same tap, no pitch change, why not gear vertical displacement to rotation? Drive it with anything you like.

Doesn't everyone?


http://www.robinhewitt.net/Falkirk.wmv

Bigger sounds like a good idea until you try it. Bigger makes for all sorts of problems like lifting and everything being stone cold when you go back to start the next layer :encouragement:

The best plastic for machining is hard polyurethane. Thermoplastics and nylon tend to string, acrylic melts and then congeals around your tool. If you are thinking to machine plastic, try a chunk of...

MDF would usually be cut with a router bit because it is abrasive, aluminium alloy with a high helix milling cutter, pure aluminium is best cold formed because it really doesn't want to cut at all,...

It wasn't what I thought it was...

http://www.warco.co.uk/milling-machines/32-wm-16-variable-speed-milling-machine.html

Suggestion: Ask Dean what motors to get and then bodge it together using...

I can't explain, I should probably shut up, it just looks unfinished. If the router moved back towards the gantry it would look better. If the lower Z axis bearings were at the bottom of the gantry...

Brass should not be a problem, don't understand why you are having trouble.
Maybe we need a close up of the cut edge, is it square, have you got vibration marks, is it smearing at the top?
Maybe a...

Obviously I know nothing because I have no machine tools that do tens of thousands of rpm, someone will be along to tell me off in a minute, but I would happily cut that in modern brass. When I was a...

Ordered. Nice to have someone to blame if they turn out to be crap.

OTOH I am becoming a real sucker, I just bought a 5" Axminster bench vice with added functionality on a whim and it seems to be...

You wish :hysterical: If you are planning a commercial venture we do it in public :encouragement:

Insight: You have to make several machines before you understand what the problems are. Nobody...

In days of yore when I learnt this stuff the general rule was that you used the same tools for brass as you did for iron, but your brass set was only ever used to cut brass. Mind you, brass was...

My £30 multimeter has arrived from Maplins and it's freaking enormous...

Compared it to my Fluke on the thing I am fixing...

Fluke 1.888V UNI-T 1.887V
Fluke 1.792V UNI-T 1.794V

Close...

Steady on chaps, we have all seen worse and he has not created a monster that will require a Hiab and skip to get it to the landfill site.
Some claims were made but we all had to start somewhere. ...

The machine in your picture has a very low gantry. If you could make yours even lower that would improve it by leaps and bounds.

Do not let pictures of machines with huge Z axis clearance persuade...

Maybe you can sue them for deformation of character? :very_drunk:

Everyone is afraid to reply, you seem a bit vulnerable to criticism and we're waiting for someone tactful to break the ice.

What other forum suggested us?

10 kg Cerrobend £162

http://www.ebay.co.uk/itm/Cerrobend-Woods-Metal-Bismuth-alloy-10KG-/261983313460?hash=item3cff6c1e34

If all you want is to flow a flat surface, why not use Wood's Metal? That goes very runny and sets hard. You could even reflow it if you moved the machine.

Have you thought about making a small machine? Most CNC problems and expense are down to scale.
Quite honestly I think you should try to butter this bunch up a bit, they can do a lot more than...