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19-03-2013 #11Its for registration . A machined reference edge to butt up against makes getting your rails level far easier than without.
I'd love to see you bend a hardened steel rail that's fixed every 80mm lol
1. It all depends on what machine you use to mill the datum, so I'm fortunate enough to have a VMC at hand. (when i use this method i get a parallelism of 2um)
The reason for asking is purely to understand where the edge idea comes from, I do like the ease of assembly, when butting the rails against the premachined edges, but worried about parallelism.
Ad, how do you mount the carriages? similar approach against an edge with a side push plate via a block bolt?
Regards,
dsc.
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19-03-2013 #12
So if your a DIYer building a router out of box section what method should be used.
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19-03-2013 #13
Yeh bud, if your milling a datum edge in for locating the rails then the machine your using to mill the datum with will have to be cock-on!
Regarding the blocks you always mount the rails like this and let the blocks find there own parallelism. So for instance when assembling a z axis mount one rail up agains the datum edge then mount the second, as for when you aline the second rail to the first; mount a bearing block on the first rail thats correctly mounted the attach a magnetic block and gauge to clock the second rail! This is a method of checking if you have milled both rails a datum edge or a way of aligning if you are using a single datum edge. then mount all the blocks and attach the second plate then attach a gauge to this and align this plate to either the first rail or the first plate (taking in consideration that the plates have good milled edges.)
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19-03-2013 #14
That's what I thought Ad (ie. rail against datum and 'floating' carriages), but for whatever reason the manual suggests going the other way, floating rails and fixed carriage.
Regards,
dsc.
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11-12-2013 #15
Just a quick question again on the linear rail installation. Hiwin manual shows this:
So master rail bolted, three linear blocks bolted to the axis plate and moving the thing up / down, bolting the second rail at the same time to make sure it's all parallel. This assumes that the two left-hand side linear blocks on the axis plate are in the same line ie. same distance from the edge and the third one is on a line parallel to those.
I have the master rail bolted down and it's pretty much parallel to the edge (within 0.005mm). I also have one block on the master side bolted and it's also cock on parallel to the axis plate (within 0.002mm). Is it a good idea to loosely mount the second linear block on the master side, slide [both blocks + axis plate] on the master rail and then bolt down the second linear block to make sure both blocks are on the same line / parallel? The whole process would go like this:
This means effectively using the master rail as a reference line, according to which two linear blocks are set in the same line.
Regards,
dsc.
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