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21-08-2010 #11
Yes! I was thinking that just hadn't got round to posting it...I'll allmost certainly do that. Maybe have 75mm or 400mm travel. Thinking about it I may as well have the lower bearing with several positions - it's only a few more holes after all.
With regards to supporting the rail at the centre I could do this when the Z range is limited, as above. It would make it take slightly longer to change between the two set-ups though.
Just to clarify I'm not using actual I beam, just 3 aluminium bits slotted and bolted together to make an I. I can't find RHS in the right dimensions so I guess I'd have to use a similar approach, just now with two 6mm aluminium plates instead of one. I'm concious that using RHS is going to further increase the horizontal distance from the router to the Y axis. Would it be ok to cut the front out of the RHS (to make a C shape) just where the spindle mounts. It's either that or get big enough RHS to fit the spindle inside?
Unfortunately that's not the case otherwise yes, I would just use blocks. One project I have in mind which needs a long Z axis is making wind turbine blades. That would, or course, be wood I should be OK.
Thanks for the help. I'll have another look for what steel RHS I can get hold of and modify the drawing accordingly.
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