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Hi Thomas

Planning to put an order from china for the T table. To reduce the shipping cost, wanted to make sure all remaining stuff is included in this order. Main things missing for me are...

Hi Craig and Pete

Yes, I understand that in order to get 100+ stiffness I need lots of mass. When I started simulating steel plate designs very long time back, that is what I also figured. The...

Hi Craig,

With these readings, isn't the stiffness you get very low? Like 7.6, 11.1, 20 in X, Y, Z?

Thanks
Sus

Did few more simulations, but it looks like getting the required stiffness (ideally 130-150 in each direction) with steel will cost two times the UHPC path (assuming no stress reliving) unless I can...

Hi Pete

Yes I always kept all three load cases inside a single study. I hoped they will be evaluated in isolation in a single simulation run. Otherwise for each axis, I need to run the simulation...

Hi Craig

I updated the design as below and now X stiffness is 250! (Y - 91, Z - 500). But I doubt this is economical, so need to reduce thicknesses, but I guess now I am in the correct path.

...

Hi Craig

I did a quick design and simulation of a similar structure to yours but the stiffness I get in X is very low. (Even with 50mm L shaped plates). For example, in the design attached, X...

Hi Craig

This clearly shows how it is built! I honestly admire the simplicity of your designs! I will also try a similar approach for my machine and do a FEA and see.

Did you rely on the...

Hi Craig

The final stiffness you measured includes everything that matters I guess - such as rails, rail blocks, etc. So overall 20-31 stiffness you get looks to be good.
I am trying to...

Thanks both for explanations. As per the structure, I have settled with C frame. Many of the simulations that I did at the start did not give me a huge stiffness benefit for some reason. My reasoning...

Hi Pete

This answers many questions I had in mind!

I have actually evaluated many of these options. In summary, Al is too expensive. Cast iron path is difficult due to lack of big foundries...

Hi Pete

I talked to a local company specialized in creating new concretes for different purposes. I told them about the CSA cement that you proposed for this work but according to them, this...

Hi Pete,
I can get Sika, but it is 4 times expensive than the one I am evaluating now. In addition, the local company (country office of Sika) is not that helpful. The grout which is available in...

I was wondering if I can use the generative design for my CNC frame. I was never able to get a decent stiffness with steel plates.

Hi Pete

I contacted Local sika again and while 3350 is super expensive, this one is 1/3 of it.

I know the modulus is not that high, but I can test it and compensate for it by larger frames. Do...

Thanks Pete. I am getting a sample of Sika 214 LK tonight. New testing will take two more months, so during that time I can model a new steel plate based frame and see how it goes.
I saw this paper...

Hi all

sorry to shift the discussion back to grout again!

I need to make a decision about the material to be used for the frame. After seeing so much shrinkage (As reported in on of the...

Thanks Craig, I modeled the rest of the CAD based on this.





What I mean by adjust was to position the bearing almost at the edge of the bearing housing. It is still free to slide in the...

Hi all

I was wondering how much the ball screw would pull towards the end nut when it is fully tightened. Please see below photos.
I want to make use of the full length of the screw thread so...

Hi Thomas

In my case, I took close to 0 data points ranging from 4Kg to 19Kg. The first reading I posted here was wrong as my measurement setup was not stable. Please see some photos of my very...

Hi Pete

I have heard about them and I also got a quote from them for epuself (too expensive). Was also evaluating this - https://www.durcrete.com.
These two products seem to be specifically...

I have done full simulations of the machine. One with grout (30 EM) and one for EG (12 EM).
With grout I get 59, 77, 100 stiff nesses in X,Y,Z and with EG I get 33, 43, 50 in X,Y,Z. I have also...

I just glanced through this paper - which surveys many previous research on this subject (Only epoxy based I think). And it shows a table of various previous researches. For me it looks like many of...

Hi Thomas

I also ditched the 3rd party testing due to exact same reason - All of the institutions I talked to were mainly focused on civil engineering and not in this sort of application. I re-did...

Hi Pete,

how did you test for the shrinkage? Did you use a length comparator?
My tests with the grout I selected gives me high shrinkage (like 10um per day for a sample that is 220mm long) after...

Hi Thomas

Did you these results?

Thanks
Sus

Hi Pete

I actually was referring to how to make the base of the frame thicker. Not sure if we are referring to the same thing.
Thanks
Sus

Hi Pete

Are you suggesting that the base be poured as two separate parts and then bolted together? Just like how the column is fixed to the base?
...

One more question regarding stiffness of the frame.

The max height of the base that can be accommodated by HaaS VF9 is 350mm apparently. (This is due to tool a changer arm). The stiffness of the...

Hi all

Thanks everyone for very valuable insights!
Based on the advices, I created a new bracket which is much simpler. the slots and tabs are only there to position each plate and a weld may not...