Gallery, Projects and General > The Design Shop
Portable milling/grinding machine for machine way reconditioning
Jonny:
Scrap machine already so scraping nothing to lose.
Wish had a tenner for everyone that said ive only took a couple of thou off, to correct needed 40+ thou.
tom osselton:
Interesting article what is the stroke on a Biax is it variable?
hanermo:
This is perfectly possible, and not too hard.
Many people have done this, videos on youtube.
From 0.4 m error, you can quite easily get to 0.02 mm or near this (or less).
I have done similar, by using linear bearings, the proper profiled thk type.
Then just mounted bench grinder onto the sled.
Worked fine.
Was maybe 0.02-0.03 max error or less.
These days, I sand ways flat.
It works perfectly well, if your process is suitable.
Ie, for me.
I use a big wide grinder. Cannot dip or groove.
Around 5" wide, iirc. Festool 1400W. Best on market. Expensive. (Sit down before You look at price).
I do lots of these.
I mark the areas to be ground "more" with felt tip. Felt tip == 0.01-0.02 mm.
Grind till its mostly gone.
All my material is wide and flat, tool steel.
Hand pressure can easily control to better than 0.01 mm error on flat steel surfaces, with some experiences.
Very important Point.
Edges get rounded with grinders. I only use centers, far from edges, so in my case its fine.
E.g. I need a 35 mm wide flat.
My surface is then 50 mm wide, and I sand flat over the total surface.
The edges are not flat, but the center part is, to better than 0.01 mm.
The Grand Old Man on precision rebuilding Richarch King has used similar and does not disallow these when used suitably.
I measure with precision ground straight edge (Vertex, 1m) and look for around 0.01 mm or less incremental error re: mount points.
You can easily feel/test/measure it by hand with linear guides.
Once they run smoothly, you know they are in range.
PK:
--- Quote from: hanermo on April 30, 2016, 05:53:09 PM ---This is perfectly possible, and not too hard.
Many people have done this, videos on youtube.
From 0.4 m error, you can quite easily get to 0.02 mm or near this (or less).
I have done similar, by using linear bearings, the proper profiled thk type.
Then just mounted bench grinder onto the sled.
Worked fine.
Was maybe 0.02-0.03 max error or less.
--- Quote ---I was thinking along the same lines. We've built and bought a couple of machines using the Hiwin brand linear bearings. They are better than any of my measuring gear and relatively inexpensive.
PK
--- End quote ---
--- End quote ---
George Konstantinidis:
Hi guys,
Last year i was looking to regrind my KRV and apply turcite. Having scraped a machine before and done all the messing with blue etc. I was not keen on repeating this myself. Before starting to do any thing, get quotes from professional machine tool grinders. You may be pleasantly surprised. I got 4 quotes from UK companies ranging from ridiculous to wow that is fantastic!
Typically machines require little work on the knee as it is not as worn as the X Y. So many places will tell you to ship them the knees table and saddle. Not sure what prices are for pallet shipping in your countries but here it is not bad.
It will save you so much time it is worth every dime spent and if they aplly turcite, you will have a fantastic machine!
Regards
George
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