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Hi Mark - I do recommend making a prototype machine first. Design or select your "tool train" ie CAD/CAM/controllers and whatever software / hardware you will use. This is a steep learning curve in...

Hi Mark - A low tolerance machine can make high tolerance parts once you understand the machine, use careful procedures and have adequate reference tools & measuring equipment. But this is a slow...

Hi Sus - As Thomas says the coating is black oxide a rust preventative treatment. Definitely run them through some degreaser or solvent before install. For those unfamiliar with the ISO bolt...

Hi Andrew - I tried a couple of Chinese boards that turned out to be unreliable. Bought 4 boards and 3 failed! Over the last few years I have searched for a good solid single box solution as my...

Hi Mark - What do you want to do with the machine? A machine with a purpose is much easier to design then a general machine. I personally would not consider a possible "upgrade" approach. This rarely...

Hi Mark - Accuracy has two considerations (plus there's many more once you get into it). Repeatability and precision. If you require "precision" then point to point tolerances as you discuss are very...

Hi David - Have you looked at multicore cable? I use 12 core and 16 core and it has made runs very easy and more compact. My supplier has 4 core thru to 25 core some with earth wire. Peter

Hi Andrew - I prefer to use full boards that do not use a BOB like Knighthawk full, Knighthawk Scribe or Dynomotion type controllers. All in one board, all functions from the one supplier makes...

Hi Theo - Why do you have to change the scale? You should never have to change the scale unless you are correcting the machine as its inaccurate... The scale should not affect your feed speeds, this...

Hi Callum - I'd look at a Dynomotion controller. It has its own thread here:

https://www.cnczone.com/forums/dynomotion-kflop-kanalog/ Peter

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...