Thread: What 'decent' Milling machine?
Going to be honest now and you may not like it.!!
It appears to me that you don't have enough machining experience yet to justify laying out big money on machines when you don't even know what you require.
For instance the best mill or CNC machine won't make relocating your part any more accurate if you don't know how to do it.!
The fact the machine you built doesn't make the grade is purely down to poor weak design and choice of materials. The fact you can't relocate on centre is down to your low level of experience.
If you'd made fixture jigs to hold your work and indexed to a known fixed reference point then it's easy.
But your machine is so weak it will flex like jelly so this can't happen. Trying to re-locate centres without a fixture is hard at best of time on any machine and requires accurate devices to help. So no matter weak or Strong if you haven't got the abilty or the equipment then you will always struggle.
Your weak build is to blame for low part accurecy for sure but has nothing to do with reloctating and no amount of strength in the machine will helps this as it's down to you to come up with ways to fixture.
Properly built DIY machine which uses good components will easily do what you want.
I dont know what I need, hence the thread to ask for advice.
The relocation of the centre was badly explained. I dont think the machine had the rigidity to be accurate enough and the centre was the easiest place to spot this. But agreed, I have a lot to learn and yes, I dont know the techniques.
So I consider myself 'told off', no problems there. At least I tried based on what I could do on my own.
Are you able to link to something that you would consider suitable on the DIY side?
Out of interest, what would a machine like this cost in the UK?
Its a Tormach PCNC 1100
When ever you have to flip parts and require more than 2 it's worth taking the time to make a fixture Jig. Provided the Jig is well made and indexed to a fixed known location you will always get back to absolute accurate position. If the machine is made from jelly then you'll still be back in absolutle position you started it's just the machine doesn't go there if it's wobblying about.!!
Not trying to sell you or anyone anything here but may be would be of interest to you. If time is not an issue, cause i am a bit busy right now.
I am currently designing a couple of small CNCs cause i want to start small home production of quality machines. All will be made entirely of 20mm aluminum plate. All 200mm Z axis.
So i have semi finished 3 designs of small machines. I don't want to load you with information now, just the thing is that maybe i will start making first the 600x400x200 moving gantry prototype. As i have semi finished drawing of the fixed gantry machine if you are interested i could provide you the drawing, only condition will be to use what elements i tell you, so you act like a test pilot
The said machine will easily handle 3kw spindle or even much more.
400x400x200mm, the bearing design and rails spacing is already tested on my previous build 1, the yellow machine, so no risks here. Parts will be around 3000$$ so you only have to put all together.
Apart from being light years better from anything i know of for the same $$ it would be extremely strong and beautiful, remember, all parts 20mm aluminum including the tool table.
Even the moving gantry machine will easily do the same plus its even more versatile. The yellow machine using mere 0.8kw spindle handles with fully extended Z aluminum with perfect finish with 1.5mm depth of cut, 800mm/min 12000RPM
And remember i am talking about OTT machines capable of working 24/7, not toys.
About the Tormach, i dont believe it could hold 0.05mm precision from what i have read around.
With a Fixed gantry machine and decent spindle it will do a much better job of munching Ali.!!
About the one on the video. Has some small important details overlooked and some weak links , that bothers me..., not up to my standard. of design i mean.
at the left is the fixed gantry, still not finished.
This is the one i intend to prototype first. I was going to hide it until ready and physically finished, but as sooner or later has to pass the "Dean test" , better now than later
I will be starting to buy parts for it next week. It will be solid aluminum beast.
Last edited by Boyan Silyavski; 17-05-2015 at 05:33 PM. Reason: drawings removed
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