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Hi peteeng,
I know you are wedded, or at least very much favour, high sidewalls and moving gantry designs whereas I favour C column designs.

What I do believe would be very instructive is to...

Hi,
I built a mill, that is to say a C column machine, hopefully rigid enough to cut steel, even if carefully. It weighs about 800kg. Its travels are 350mm x 350mm x 350mm.

Plenty of Z axis...

Hi peteng,
just scanning through the Hass PDF and it looks like a standard (BT40) VF1 is 3200kg while the VF6 breaks 9500kg. Both are still very heavy but not quite 11.5T either.

Craig

Hi,
yes the manufacturer does have a website. I did not buy off the manufacturer, I bought off Ebay from a guy in Vietnam. The spindle is new, but I would guess old stock. There is no exactly...

Hi,
OK, I would guess your estimate of the weight of the X and Y axis combo of 300kg is about right. That in turn suggests that your servo could hold it aloft without reduction. That would leave...

Hi,
you need to do the calculations, you are as you said electrically inclined not mechanically inclined.....me too as it turns out, but if you're going to do this then you
need to put numbers to...

Hi,
given the rapidity of the flow through the spindle I don't think that I really need a flow rate detector....but just something to confirm the flow.

I'm thinking of a wee cheat, cheap and...

Hi peteeng,
very true.

Your model does rather highlight the gantry as the 'weakest link' and that the gantry is also the least suited to casting in concrete/UHPC or whatever.

Like it or not I...

Hi peteeng,
1.8 tonne of steel for only 50N/um? I know this was only a rough 'sketch and analyse' for the purposes of discussion, but that is still a swag of steel for that result.

I believe...

Hi,
I use 750W Delta B2 servos on my mill. They are 2.4Nm (rated), 7.1Nm (overload), 3000rpm (rated). They are direct coupled to 32mm C5 BNFN double nut THK 5mm pitch ballscrews.
They can go up to...

Hi Peter,
I've just cleared my inbox.

Most certainly I'll get one for you, in fact I'm going to get another myself. They are good.

They are a capacitor run motor so you do have to wire them...

Hi,
my pump turned up, the Oriental Motor/Stainless Gear pump one. It's superb. I paid $46NZD plus $10NZD shipping from Napier, and yet I'd swear I'd pay $400USD or more for this thing new,
its...

Hi,
that's good news.

16mm wall sections are very much the exception here in New Zealand which make it a very expensive option to procure.

Craig

Hi,
the advantage of 16mm wall is that its thick enough that you can drill and tap with decent size bolts. 10mm or even 12mm wall does not really allow you to drill into the end
with anything but...

Hi peteeng,
yep, they look like a cost effective way to do things.

Craig

Hi,
another thing you will need, and its not something you have to buy, is some spoil boards.

I have a couple. They are just a squares of acrylic. They get pretty scarred up after a while so...

Hi,
time and time and time again I reach for my Mityutoyo calipers. I couldn't possibly count the number of times I've used them over the twenty years I've had this set....

I have a set of...

Hi,
bigger is better. The first moment of area is very dependent (to the square? or maybe the cube?) on the outer dimensions. Increasing the size will easily make the structure stiffer even without...

Hi, Peters both,
they are good ideas.

I set up the oscillating pump I already have on hand and ran my spindle with it over the weekend. The flow rate I measured was about 800ml/min. I found that...

Hi,
if that improves the stiffness then yes that is a good move.

You need to strike some kind of balance. In a gantry machine it is usually the gantry closely followed by the Z axis that give the...

Hi,
the thickest RHS and SHS sections I've seen listed are 16mm. They are not common. New Zealand steel suppliers do list them but on indent from overseas.
No idea how much you'd have to order to...

Hi,
I've used Mach4 and an Ethernet SmoothStepper for nine years and Mach3 prior to that. To say I am biased to Mach is an understatement.

NCStudio is a lesser known and lesser supported...

Hi,



Why???? It adds mass and not much else. In order for the filler material to participate in the load sharing it must adhere perfectly to the inside of the tube, something that concrete will...

Hi,
I rather think I've made a mistake......I've made one once before and I swore I'd never do it again!!!

The oscillating pump pictured above is 14 l/min......but I have reason to doubt that. ...

Hi,
steel is 205GPa while even good concrete is only 50GPa.

What makes you think that filling a rigid tube with concrete, which might as well be as stiff as a limp noodle, and have it be a great...

Hi,
flexure is the death knell for any metal cutting machine.

Even with a small cut the tool tooth has to be held against the surface with sufficient force to cause a chip form. It does not...

Hi,



That is almost exactly what I said from the beginning.

I suspect the PWM output of the servo drive is 10.7kHz, or maybe some multiple of it. The cycle rate of the control loop has...

Hi,
to be honest I think a fly cutter of 350mm is going to cause your machine to flex uncontrollably.

Just to be clear......you are cutting steel ....correct? That is if I'm reading your first...

Hi,



But exactly what are they? As far as I can see they are all marketing hype rather than anything substantial. Smaller motors and drives....so what?.....faster response and settling...

Hi,



I use Delta B2 servos, and the real question is 'why not'. Sure the B3 is newer, and while its competitively priced it is still more than a B2. Is there anything that a B3 can do that a B2...