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Hi Craig - There are a few threads in the forum in which machined parts especially rail foundations do not come out flat. Plus these have been done by "machinists". It is not perfectionism it is...

for those interested in concrete - Peter

https://youtu.be/_AzywzR6Is8

Hi Walnut - Just buy a Knighthawk controller. It will run on the new computer, use wifi to run if you like, even use your phone to run the cnc. By the time you muck around trying to convert and...

Hi Sus - The surface grinding can't correct a poor surface. If its a magnetic type the surface has to be flat to produce a "flat" on its opposite side. If the plate is pulled down on the grinder it...

Hi Jack - Have to be careful with "short or deep" beams vs slender beams. Short beams can be shear deflection dominant and will not follow the usual slender beam formulas. If you have FE available...

Hi David - Yep Jaffas are unique Oz/NZ lollies. Ideal for rolling down the isles of movie theatres is the urban legend... Peter

Hi Jack Jr - In my deflection tests I also use a piece of aluminium and could correctly predict the stiffness of the aluminium. Here's some shots of the set up. I used a reference beam above the...

Hello Mukatadir - I run training when I sell a machine, usually a couple of days. I'm in Murwillumbah, Northern NSW. But if your running your machine and know the basics just create a question list...

Evening all and Sundry - I keep coming back to laminated ply and aluminium. Seems to offer many advantages. So I modelled a 100x100x12 SHS cantilevered beam and a 100mm wide beam with 6mm plating...

Hi David - Great intermission, I can go and get some Jaffas.. Peter

Hi Dave - A clear photo of the name plate would help. Peter

Hi Jan - I think you may need to add another zero to your budget. Peter


https://taigtools.com/product/micro-mill-2019cnc/
unless you go at something like the Taig

look at SYIL but add a zero...

Hi Jan - by 3-4K do you mean Rupia or USD? Peter

Hi Thomas - I think wacking the beam is the issue. Why not just bend it by hand a bit and let it go? Peter

Hi PIO - A moonshot thought for you. But I think the reinforcement cage is an error... Peter

https://www.mmsonline.com/articles/inside-oak-ridges-3d-printed-machine-tool-moonshot(2)

Evening all - Some more stuff on HP concrete. I am contemplating 3D printing a part "skin" in plastic then inserting the inserts then filling with grout as a test part. Hmmm. Peter

Fiber...

Hi Pio - For steel I'd call thin 3mm. I use a lot of 3mm laser cut steel. This is because its the thickest steel that is zinc plated. So I don't have to paint it. But then I also laminate it so I can...

Hi Thomas - Now I know what you mean by high/low Ta. I like pictures... Yes your maths checks out... :) So your bar has a zeta (loss factor or damping factor ) of around 0.01 a bit to go to get to...

Hi Thomas - The decrement should be the same, what is the voltage peaks in this image from your test? The decrement calc can be across two peaks as per decrement 1 image. Or it can be across several...

Hi BH - If the part has lots of short moves and corners then the max speed setting does not matter as the machine never reaches the higher speed. To move faster in this case you need to up the...

Hi Thomas - Is this the correct interpretation of your data? Could you draw the rough values and graph please? Ta Peter

Hi Thomas - My research into material damping has been similiar. It seems to be more of a comparative effort more than a defined science. Although the maths are clear the results are always variable....

Hi Jubee - double strength vinegar works a treat (normal vinegar to just takes longer) and is friendly on the skin... If you can put it in something and soak it the rust will be gone overnight. A...

Hi Sus - On the point of chips - any flat surface will accumulate chips and muck. So even the flat at the bottom of the column (ballscrew channel) will fill up so open that to the bottom as well....

Hi Thomas - To calculate the logarithmic decrement you only need two peaks. See wiki - Peter

https://en.wikipedia.org/wiki/Logarithmic_decrement

well done with the experiment! now get a piece...

Hi Sus - Give it a good coat of wax. I use paste wax and would give it 5 coats of wax for MDF melamine surface.... Peter

Hi Sus - I'd add webs to the long sides. They may bow under hydrostatic pressure. You can test this in FE by adding a hydrostatic load case to the model. MDF is 4000-4500MPa modulus. I presume you...

some more machine fun - Peter

https://youtu.be/q3kw75XCj_4

Double Column Machining Center - HD Video produced by ???? S&J Corp - YouTube

Hi Pio- Not sure if your following the Milli thread. I pursued the exo-portal design and got the weight down to 730kg with all axes 100N/um. It could come down more with some more time. The portal...

Hi Pippin - Same problem once you put an enclosure on so make access same as having an enclosure. The "box" can be taller so the hole is bigger giving good access. Maybe the front of the "box" is not...