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Evening all & sundry - I was looking at No5 and was about to cut the gantry down to save some weight. Then I thought it looks ideal/easy to set up a twin rail on the columns. I have looked at this...

Hi All & Sundry - I have updated Milli to No5. This mainly concerns the tool carrier. I have to have a place for the spindle motor and in another gantry thread we worked thru so many options and a...

Morning All - Today I looked at the geometry and the rails and changed a couple of things. I now feel like I have control of the stiffness. This config allows adding or subtracting stiffness much...

Morning All & Sundry - So Milli-LG No3 has hit the marks. But its a bit big. So I shall redesign using 25mm rails and the ER16 power head. Come back to a 250x500mm table size and see what it looks...

Hi Chris - Matilda will be an excellent machine. Everything needs TLC. Great story.. Keep at it Peter

Hi Craig - Collimated or not its sold for machine alignment and measurement, I'll look around for the Zeeman, thanks for the lead. My collimator is used for straining veges :) Peter

Morning All - I have been looking at laser alignment again an can get construction lasers for <$400AUD that are accurate to 2mm over 30m. But they are useless for a machine. The latest quote is about...

Hi Gully and peers - Seems Clag and Perkins were originally made from potato starch but later on moved to PVA. Cheers Peter

Hi All- Opps I quoted the actual deflection in um vs the static stiffness in the last post. Converting the Mikinis deflection to N/um is X 94um is 11N/um as I applied 1000N, Y is 22 and Z is 24N/um. ...

Hi Gully - I suppose you were down the back of the class eating the Perkins Paste as well :) Perkins paste is PVA glue in some sort of carrier. Generally has "non toxic" on it. One of the only glues...

Evening All - Thanks for the spindle feedback will be handy. Some of those power heads look very good.

I have been thinking about the column and how to remove it. I have also been thinking that...

Hi Gully - As you say good paint is prep prep prep... Have you tried white PVA glue diluted 1:1 with water as a sander sealer? I use it a lot. Its sort of like shellac, I apply with a rag not a...

Hi Craig - I don't disagree about foundries and tradesman etc etc. I deal with foundries for steel and aluminium on and off for marine and mining equipment. I think there are other ways to skin the...

Morning IHNF - Thanks for the heads up. Can you suggest a suitable supplier? Cheers Peter

Thanks Ard - I'm sure there is a quality grade per cost. Once I get the structure settled I can investigate that issue. So green is bad blue is good
:) Maybe a different one will show up. A round...

Hi Ard - The spindle has currently three options 1) ER17 2) BT30 and 2) high speed router spindle.... the ER and BT motor will be a 80mm (or 90mm) frame 750W or 1kW option AC servo. See images of...

Hi Sup - You 1) have to design the machine based on premade lengths 2) order the screws made to length 3) Buy premade lengths but machine the ends yourself to suit. I get screws made to length from...

Hi Ard - Here's a cast iron kit. I think you mentioned about buying a kit? Peter

https://allcncrouter.com/collections/cnc-milling-machine/products/tabletop-cnc-vmc-mill-frame-kit

Hi Craig - Foundries are a dying trade. Not saying that they are wrong just in a few years printing will replace most of that and CI will die out from machine tools as well. Composites will replace...

Hi Ard - Cast Iron is out as I can't do that myself... cheers Peter

Project Summary

Milli Initial thoughts (Metal Mill)
BT-30 spindle, 500x500x500, 20N/um model stiffness, target actual stiffness >10N/um
composite for superior damping, make as many parts...

Hi Klaas - Yes I'm very lucky to have a spot like this. I rechecked my resin tally and its correct. I did not carry over a couple of figures correctly in my weighing tally so I actually used 19.7kg...

Hi Pippin - Yes I think 6mm is a good thickness to allow for all the issues that "self levelling" epoxy has. But 6mm (1/4") of epoxy is quite soft for a rail foundation.

This company does...

Hi All and Sundry - Up early to do the floor before it got hot. But stopped early as I ran out of resin. The pail says 20kg but I only got 18.3kg out of it. Have to talk to the supplier next week....

Hi Pippin - What thickness was the 105 cast to? I don't think epoxy is a good answer either but its good to know what people are doing and the results. Peter

Evening all - Moved the LHS stuff to the painted RHS side today. I sanded the painted side with my 5" orbital just knocked the pips off. Tomorrow paint the LHS. Then get some infusion VE or may use...

Hi Klaas - I thought about that the other day actually. But it gets away from my customer base of DIY/Makers etc. And it starts to compete with "real" mills so I think its scale down not up. I'm...

Hi DAAD - I was wondering about the 10N used for the friction in the AVID data so checked it out. I'm assuming here that you have 20mm rails. I looked up a car static capacity and used the graphs...

Morning All - Been working on the workshop. Painting the floor.... also the Mens Shed opens this week so can get back into YaGs build. Need to get the metal parts on order. I've decided to pull down...

found this readable article on stepper motor control Peter

https://www.edn.com/improving-current-control-for-better-stepper-motor-motion-quality/