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Hi Peter - The simplified bearing I made is "bonded" to the linear rails. Good catch about the fact the they should able to slide in order to predict the deflection of the machine more accurately. I...

Hi Peter, you have definitely written some insightful very helpful information in your replies. I'm currently out sailing with some friends. I'll be sure to reply when we get home in the weekend :-)...

Thank you for sending a link to the thread on stiffness measurements Peter, that was insightful.

Regarding the arrangement of the guideways Peter, could the increased stiffness potentially be due...

Hi Peter, thank you for the replies. I'm aware of draft angles, all the relevant surfaces will have draft angles on the final part. I've been researching again and reading some threads on the forum,...

Hello everyone - As mentioned the other day I contacted Jingjiang City Jianken High-Speed Electricmotor Co., Ltd. about a CAD model for their JGD-85 2.2 kW ER-20 spindle. After I few messages I had...

Hi Peter - Well my resources doesn't have to be a limiting factor... The idea of buying a cast iron plate was to find a supplier that could also grind it or make it flat with a precision mill....

Hi Peter I have not found any source of flat milled composite slabs. But you right, and it annoys me a little too. I'll make the saddle and z-axis "backplate" of composites too then. I hope my mill...

Hi Peter
1) Good idea, I intended selecting some kind of pot that would be bigger than a throw away container. Waxing the mixing cups or container for easy clean up, that will definitely make my...

Hi Hanermo - That sounds like an beefy machine. 0.12 mm deflection is more than what I would have expected for a machine that can mill still "somewhat efficiently" as you state. I'd love to see a...

Hi Peter - Things have been moving a bit slow here, lot's of things going on right now. Yes regarding materials, the plan is to use woven carbon fiber for the skin of the components, and then use...

Hi Peter - Glad to hear that FEA will estimate the stiffness in real life, assuming that one would constrain it correctly. F360 is great with assemblies, but sometimes there can be trouble when...

Hi Peter - Great numbers regarding machine stiffness. You're right 70N/um is perhaps a too high then. I'll see how strong I can make the Z-axis without adding absurd amounts of weight. Then when I...

Hello, I'm back with some design updates. I've been tinkering a bit around with some FEA and shape optimization in an attempt do design a rigid Z-axis/clamp. Again this has been designed for a...

Hi Peter - Oh you meant that the base had to be stiff, and not the rails... Yes, the base will end up very stiff indeed, no worries. Thank you for your explanation of drivers and motors peter, that...

Hi Peter - That was a great little read. I've seen plenty of videos of people cutting steel with HF spindles, I found a guy that had build a very stiff fixed gantry frame and had excellent results:
...

HI Peter - My space for the mill is very limited, so it has to be an moving gantry mill. I'd like it to be similar to the machines that Datron builds. Interesting pictures and constructions Peter,...

You're right, it's very stiff. I'll aim for 70N/um at the moment and then perhaps adjust that spec a bit if it proves to difficult. For what I'm intending to use the machine for, 120 mm clearance is...

Hi Peter - Great feedback as always. Good point about the fact that hollow parts vibrate, I would never have though of that although it makes sense now that I think about it. Ahh yes the motors......

Goals



Mill aluminium moulds
Good surface finish in aluminium
Have a very damp machine
Get experience with casting composites
Have fun!

Hi Peter, you're right about the scope of the machine. I've got a bit caught up with achieving something that is perfect that can produce something with very high tolerances. I've sat down and though...

Thank you Peter, I have lots of stuff to think about. You're right I don't have to select a material, I can simply make a few comparisons and designs which eventually will point towards the best...

Hi Peter
1) Good idea, I already have all the requirements and specifications written down, but it would be great for me to expand a bit on what my personal goals would be and such.
2) I will...

Hi Pete - I only got to reply to message #7 before, because I forgot to refresh the page the next day. Peter this project is really warming up my heart and love of engineering. I'd really like to...

Hi Peter, thank you for helping out in general and explaining the formula for rigidity, this is very helpful and valuable information. =)

I've been thinking about the requirements and...

Okay, a little something about me: I graduated last summer from a gymnasium, and I'd like to be an engineer (not sure which kind yet but something that relates to consumer products or metal machines)...

Okay so I've been testing the impact of filling 'Beam 5V' with tubes, rods and some square steel profiles, but none of them seems to make the beam deflect less. They're actually increasing the...

Hello Pete, and thank you for the warm welcome to the hornet's nest. First of all, I'd like to express my gratitude for your great reply, just wow. You opened my eyes to the deeper levels of machine...

Hello, I'm going through a very extensive iteration of ALL the suitable CNC Router designs for a machine that can mill steel with a decent material removal rate.
I plan to document the project with...