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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...

Hi,
I have used Mach4 and an Ethernet Smoothstepper for about nine years and Mach3 prior to that.

Mach3 is obsolete to my way of thinking......NFS (the manufacturer of Mach) has ceased all...

Hi,
the cycle time may be 3.1kHz, that is to say the PWM gets calculated afresh at 3.1kHz, but the PWM tick rate is much MUCH faster than that, more likely 20kHz.



I am coming to the same...

Hi,
to be honest the recommended chip load and so on for the face mill is just not useful at the moment.

Your machine is going to be rigidity limited, and the cutting forces and thereby the...

Hi,
found a local company to sell me an oscillating pump. Up to 55psi and 14l/min. I suspect and hope that at say 15psi I'll get 5l/min. The pump itself is industrially rated, and for my application...

Hi,
I have got my new Delta VFD this morning from the US, its a second hand 11kw unit. I paid as much for it as I would have a new 5.5kW unit....so I thought why not?. If I ever get an even bigger...

Hi peteeng,
that diagram looks incomplete?? I'd swear that the diagram show the outer ring gear, the strain gear and the output bearing ........but where is the wave generator?

It's common that...