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Thanks Pete.

Hi all,

Could I get a little help choosing belts and pulleys to connect my 2.3Nm Nema23 steppers to the 16mm ball screws, please?

I want a 1:1 ratio. The motors have 6.3mm dia. shafts and the...

Thanks Craig, however I don't think that is the issue. When you are in 'step' mode and press shift it switches temporarily to 'continuous' mode.

I think I did find the issue here though!...

Pulling up this old thread. I run Mach 3 with a wireless keyboard.

In continuous jog mode it works fine. However if I am in 'step' jog mode and then I press shift and an arrow key for about 1...

Thanks for the replies. I don't know who the manufacturer of the worktop is, it was an offcut and the supplier is not great at communications so it's probably not even worth asking. All that's marked...

Update!

I got 30mm thick quartz, 1m x 0.6m and 2m x 0.6m

I created a steel support frame with screws around the top that I can adjust to support the quartz nicely.

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I got myself a...

Thanks!

I did buy some man made 'quartz' worktop material but haven't picked it up yet. I also got a proper straight edge so I can see how it looks.

My hope is that the quartz style material...

Hi,

I can't afford a surface plate the size I'd like for my projects.

I wonder if anyone has experience of just how bad standard worktop granite is in terms of flatness? Is it just terrible, or...

Hi Pete,

Yeah it is indeed my intention to have L brackets that fix each X section to the main rails to allow slight adjustment. I'm no expert welder, lucky if I can get a bead without holes in it.

Hi Pete,

This seems to work very well. Using 50 x 100 rather than 100 x 100 for bracing with a more dense pattern. Should be cheaper, nice and stiff and also supports the bed surface more evenly....

Hi Pippin,

Lets calculate the air speed around the tool.

(EDIT: Oops made a mistake - updated now!)

The website says we need 3000FPM (feet per minute) to keep all debris suspended in...

Hi Pippin,

Thanks for the link I will have a good look there.

Initial reading suggests to me the recommended 1000CFM is based on a free space calculation, like maybe a hood over a sanding...

Hi Etee, :p

Do you mean the bed or frame doesn't need cross-bracing? I think it must, because there will always be un-even loads in the frame and especially there will be a resonance loops that...

Can you expand on why you think it won't work well?

To be clear, it will have a brush attachment and move down to touch the work piece. It's not going to sit up in the air like that.

I use a...

Hi Everyone!

I got a bit of time over the Easter weekend to work on this design.

I created a dust extraction shoe design which I will 3D print.

I also worked on the frame. I'd appreciate...

Anybody got some design ideas for a retractable dust shoe for ATC spindles?

Working on the Z-axis design now and I want to grab the spindle as near the cutter as possible for stiffness, but I'm...

I should have replied. I do not have a specific stiffness goal, but just making comparison between practical options.

Thanks Peter, that makes more sense for me now.

BTW my name is Simon ;)

I've started an over-all build diary and questions log . I'd really appreciate your input there if you have any points to...

Hi,

I intend to design and build a vertical (or near vertical) 4' x 8' CNC router that is sufficiently beefy to mill aluminium or take deep and wide cuts in wood.

I currently have a 2' x 4'...

Looking at data for epoxy though, it does have better compressive strength than tension. So is it not still a benefit to bias in compression?

Or does it simply not matter within the elastic range?...

Nice!

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You are right Pete, a double layer ali construction is a nice option! I've used constrained layer damping before and it is actually more effective at low frequencies than any materials intrinsic...

Hi Pete,

Thanks for the figures and advice.

I reduced the simulations Youngs Modulus to 35GPa and Tensile to 20Mpa based on a paper I found. It still comes out pretty good.

I also did a new...

P.S. I was only using the built in material library for 'granite' in fusion. If someone can give me reasonable data to model typical E/G mix that would be very helpful.
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Thanks for your reply! Also thanks for the idea of leaving the centre hollow to save weight.

Can you expand at all on why epoxy granite would not benefit from being pre-loaded in compression?
...

I'm starting to design a new router. I want it to be pretty heavy duty so I started doing some simulation in Fusion 360 on the moving gantry beams to start.

Comparing chunky aluminium profile...

I'll repeat what I was told recently. This made me decide to go for the 3-phase steppers (plus more cash for spending on an ATC setup) it's a bit long but worth reading. Thanks to Dean / JazzCNC on...

It sounds like we have a similar shopping list. It was recommended to me to get 3-phase stepper motors / drive as they are significantly smoother and have a wider torque curve.

I am considering...

Thanks for the reply! The seller sent me some pictures from the actual spindle and there are no drive dogs. So provided if I attach the correct pull stud I could buy ISO30 tool holders that are...

I'm currently in the early (all in my mind) stages of designing a vertical cnc router. I want to choose the spindle first so I can work outwards from the Z axis in my design.

I know that I want an...