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Portable milling/grinding machine for machine way reconditioning
PekkaNF:
Thank you all!
Having this ground professionally is no go. I have asked prices and most said that they were not interested or I would be better of buying a new taiwanese one than paying a bit more for them to have a go on in.
One retired gearbox designer (industrial size, mines, wind turbines and such) visited me today an we plotted some ideas. It's not going to be too hard, but it might be too much work. Got three books on maching and measurement 1970-era, I'm not taking on knitting - yet.
I started measuring parts. It's nice to know which size parts are how much space I'm going to need.
Next step would be to figure out how to tackle each part and how to do it. Then I would have pretty good idea how big rig I need for it.
Some advice was really usefull, any pictures or links to projects members have done to regrind ways would be nice.
I did consider using a bench grinder as a grinder head. No way ideal, but it could work. I'm not too keen on routers or any die grinder....way too small stone and too much dressing.
Pekka
Jonny:
What you have to bare in mind is no amount of beefiness unless a proper way oversized machine will be accurate. Typically these machines are solid objects weighing by the tonne and around 16 foot long.
C Linear bearings your limited by the frame beefiness and runout plus dia of bar used, terrible flex even for woodwork, soon as It starts theres no stopping it just gets worse and worse trying to correct even with a small dia cutter.
PekkaNF:
Not sure if I follow you Johnny.
I agree that normal milling machines and even more grinding machines are a hefty affair. But that is greatly because the working envelope is big and they are designed for production = ability to shif crapload of metal in no time.
I have seen whole lot of amateur routers that are designed for huge work envelope and 600w chinese router....
I'm aiming here lower. Only one movement is large (X-axis), one axis has feed of 20-50 mm, cutting depth adjustment in order of 1-3 mm. 1,1 Kw motor and that's pretty much it. Rails have to be pretty close to cutting point here or there will be problems.
Pekka
hanermo:
I used a glass dining table as my reference surface, for 2 m long surface.
The v1 linear bearings ran on it.
Worked ok.
Then, a wood tabletop, with 20 mm thk linear bearings bolted to it.
Worked very well.
The grinder was the typical 30€ desk grinder.
Flatness had about 0.02-0.03 mm or less error, for 600 mm travel, +/-.
A grinder has tiny loads, if you are hand feeding it.
Typically, it might be 0.2-1 kg at most, of tool pressure.
*Because* everything is floppy, it actually works pretty well.
You dont get tool bounce, etc. It just bends off.
And a 350W motor has little mrr.
Grinding about 600 mm with 2-3 disc widths took maybe 1-2 hours, back in 2006 or so.
I had zero linkages.
Just a steel sled, rigid mounted grinder, linear bearings.
Push by hand.
Works fine.
The low-power grinder is (or seems to be) quite safe by hand.
It just bogs down.
As Pekka said, an industrial grinder thats used for grinding machine ways, is 20-30 tons.
But that because is has a 30 kW spindle and does one pass.. done.
Pete.:
Buy this and set yourself up in business!
http://www.usedengineeringequipment.co.uk/store/p78/No_75___Elliot_Plane_Mill.html
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