Thread: New CNC Mill on the horizon
check your PMs
Hiwin: New, Two rails and 4 blocks, 15mm*640, £80
Hiwin: New, Two 15*760mm Two 15*1150mm, 10 blocks, £360
THK: New, Two rails and 4 blocks, 25mm*760mm, £100
THK: Used, Two rails and 4 blocks, 25mm*300mm, £80
...etc, you just have to be patient and I need to stop buying them all!
All of those prices are significantly less than the eBay listing linked to in post #7... than one isn't a good deal.
I still want to get two 2120mm rails for my X-axis, but ones that long don't come up very often at all and postage is of course very expensive.
Last edited by Jonathan; 28-10-2012 at 05:36 PM. Reason: Typo infestation
Forgot to mention, those are all rails/blocks with 4 rows of balls which is what you want since their load rating is equal in all directions and the moment load is greater. Two rows is still fine if they're quite big and clearly still far superior to supported round rails.
I found them to be a good seller. About 3 weeks to arrive and reasonably packaged in a thick cardboard board with lots of bubble wrap. Would buy again if building another machine (!). My parts were clean and ready to use.
For info I see alot of machines using supported rail on the Z axis and whilst there is nothing wrong with that I would recommend new builders (or upgraders) to have a look at these used profile rails. Putting aside all the advantages of profile rail, their compact size makes for a neat installation in an area of the machine that benefits from compactness. And these short lengths (typically 300mm in a 15mm width) make it good value at about £80 all in.
I know what you are saying about the longer lengths. For my X axis (1300mm) I went with new supported rail from linearmotionbearings2008 (ebay).
Since the Z axis always has an unavoidable overhang I would personally go for 4 blocks.
Ok I'm going with profile rails on all x,y & z 4 blocks on each rail.
My thoughts are going towards a low level gantry eg minimum deflection in relation to the x axis with the adjustability of the bed. I have access to a fair bit of 100mmx100mm off cuts and was thinking of using this as the base for the machine. Would this be too extreme for the gantry?
Right I have had an hour to play in solidworks so this is not very detailed its just an outline of the idea I am thinking of once I have ironed out any potential problems I will go in a bit more detail.
So once again 1200mm x 800mm bed current z axis 200mm ? good bad ugly?
z axis is based on 4 blocks sitting on a 200mm square footprint eg one on each corner of a 200mm square.
Adjustable bed for altering depths of material / things to machine.
twin ballscrew on the x axis, single on the y and z
concrete/ sand etc in the box section taken on board I will give that a go.
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