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Hi All - Epoch5 is maturing. I only have the rotary to integrate into the machine base and its ready to detail for manufacture. I have most of the structural parts in stock... Craig in the image with...

Arrggg its for a Mac! :)

Hi PIO - enable your PM's Ta Peter

Hi David - Thanks I have a look at Pixelmater don't have photoshop or anything like that. Peter

Hi David - Can you give a brief description of how you do your imaging? I'ts always impressed me.. . Peter

Hi all - Heres a nice table of small mill specs.

https://www.ajax-mach.co.uk/mini-cnc-lathes/ajax-proton-mini-milling-machine/

If your going column like these go 2:1 on the envelope plus you...

Hi All - Since its currently a design exercise I'd go max expected Z and once a more details are in place cut it back if needed. I don't think the gantry config is any less difficult to change the Z...

Hi PIO- I'll have a read of freecad fem and see where its up to. Can it do preloaded bolts?
1) re mesh in the settings image you are using second order elements. If your solve time is long change...

Hi All - I usually use 100x10 or 100x12mm flat bar for the top of the wall. But using the 30mm rail means it does not fit with the 16mm ballscrew bits unless I make a custom nut mount or am I game to...

Hi Craig - The issue with a large metal slab for the base is that no machinist in my area has a mill big enough to level it, and I don't have lifting gear to lift it. I say a lie actually because one...

Hi RDD - no mock up attached. But I imagine its a 24" long slot in 3/4" timber. The fastest way would be to use an upcut tool thats smaller then the slot size and do it in one pass down the middle....

Hi Craig - The maths process gives insight to what is needed. A ribbed design will be less stiff then solid at the same width. It all comes down to the many variables each Maker has. The numbers...

Hi All - I'm looking at the walls of the Mill.

Its distilled down to a high wall design. The way my routers work they require a 100mm wide land on the top of the wall to accommodate the rail and...

Hi Pio - Having been at this same question for a few years here's my thoughts:
1) Seems industry is not really concerned about the static stiffness of a machine for comparison purposes, otherwise...

Hi All - I often sight a stiffness chart to people here. But I have not been able to find where I got that snip from. Today I was looking for an article and came across it by accident! In "Metal...

correction Ante not anti

As long as you don't answer yourself back... you will calculate the logarithmic decrement.. Peter

Hi All - I've had a play with the column design. I made the arm 300mm high vs 250mm and this made the C frame a bit better. Although I feel with tweaking I could make the C frame same as the gantry...

Hi Pio - To stop littering your thread I have done a C frame to gantry face off in my Milli thread. I've had a small mill on the list for a couple of years but have been struggling with materials and...

Hi All - In another thread there has been debate over c column vs gantry style machines and various materials. I have made a comparison study to investigate this issue. Its a face off; raised moving...

Hi Craig - I'm not wedded to a particular config. Each config has its place same as each material has its place. Column mill designs are good for small Y axis machines so the table tends to be 2:1...

Thanks Craig - Looks like I read the wrong column (the VF-8 column). I have started shelling out Mill 1. Only lost a couple of um so far. But there's holes in the blocks so the shell is weird and...

Looking solid David - Peter

Hi Thomas - If you have a high speed camera you can image the cantilever damping. So support the beam on your nice steel table deflect a set distance and image the vibration / damping. Count how many...

Hi Thomas - One of their mixes claims E=80GPa. Give that a go. I expect in flexure it will be lower than the compression value. That would be interesting. I tried to get some shipped here some years...

Hi Thomas - The concrete chemist I worked with said that the bigger the aggregate the higher the modulus. We use a stone called blue metal here, mainly basalt. I don't understand why that would be....

Hi all - I had some time so upped the size of the gantry and the saddle and the Z plate. Got it to just under 11um which is close to 100N/um a good starting point. I think I should have modelled the...

Hi Craig - The next step would be to shell the parts until they came to reasonable weight with minimum stiffness penalty. It's a trade study and Round 1 so weight is not currently the main concern....

Good Morning PIO & Others - I've had a restless night going over my EG stuff. This morning Thomas published his bending test data on his EG and it came out at 22GPa. He has done very careful work on...

Hi Thomas - Good news. The numbers are in. Good to see they are the same order as mine. I've had a restless night thinking through the epoxy granite stuff actually. Come to the conclusion its...