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Hi Peter (and others)

Given your interest in material properties, I thought you might be interested to see the following papers:
...

Hi,



Using, in isolation, the equation you have provided here, you could be encouraged to increase the diameter of the screws to say 50mm and achieve, in the case of the 10mm pitch screw,...

Hi Mactec,

Thank you. I would definitely need to check, but I believe the CTB servos have 17 bit absolute encoders. I will certainly bare that in mind.

Mike

Hi Craig,

Yes, I did consider pricing components before starting the build, however I did intend to begin with relatively cheap components, i.e. rolled ball screws etc from china, with a plan to...

Hi Mactec,

Thank you for your input.

I am currently trying to source the various components for this build; so far I have managed to pick up some brand new THK SHS45's with extra long...

Hi Jack, and Raj. Thanks for your interest.
I employed the concrete's own 'heat of hydration' to thermally cure the frame elements. Essentially, as the cementitious materials reactions are...

Thank you very much for the detailed responses.

I think I will take your advice regarding the targeted accelerations and axis speeds, as well as designing using the rated torque. I will also take...

Thanks Craig,

I'll take a look.

Mike

Hi Craig,

I've just revisited the CAD Model; the maximum travel lengths I can achieve (and would therefore target) are approx: 1100mm (table axis); 1600mm (cross-bridge axis) and 700mm (z axis)....

Thank you again. These calculations and tips are very helpful.

It looks like I have a number of suitable options to achieve targeted speeds and accelerations, within rated torque specs. I think...

Hi,

Thanks for the suggestions and calculations (very helpful).

I should clarify that I am certainly not looking to achieve 1g accelerations now. This was simply where I happened to start when...

Hi all,

Thank you for your comments, these are very helpful (and for the spreadsheet, thank you Peter).

It is probably worthwhile elaborating somewhat on what I want/expect from this machine....

Thanks Peter, I will give carbon fiber some thought (may be a future upgrade).

This is as far as I have got with the build thus far. It is worth mentioning that I have dedicated a disproportionate...

Hi Peter,

Thank you for your interest. You might be interested in the following page by Durcrete (https://durcrete.de/wp-content/uploads/2015/06/downloads-Nanodur_Maschine_E_0615.pdf), which shows...

After de-moulding I placed the bridge on the base for a test fit. The bridge will have to come back down for flattening work on the faces and to prepare the mating surfaces which is unfortunate...

After about a week in the insulated moulds, I was able to demould the parts. The melamine separated fairly easily ( I did not use a mould release agent). Unfortunately, I had also used some standard...

Hi Peter,

In terms of tensile/compressive modulus, all of the papers I have encountered simply refer to elastic or Young's modulus and haven't distinguished between whether the modulus is...

Initial testing of my UHPC recipe was not successful. I had procured various samples of the constituents, but attempts to mix these in an ordinary drum mixer simply never properly mixed (this was in...

The next stage of the build was to design and produce the moulds. I haven't necessarily modeled all features, but modeled enough to create the needed cutting lists for the melamine faced mdf. Here...

The first thing I needed to sort out for this build was a means of handling the heavy parts. The bridge weighs approx 3000kgs and the base approx 2500kgs, and needed to be cast face down. This meant...

Hello all,

As the title suggests, I am building a large bridge type CNC mill from DIY UHPC.

I am currently part way through the build, so there is too much to cover in one post. I have already...