Something like gelcoat then?Quote:
Originally Posted by FatFreddie
Just been to the local fasteners shop so now I can get these rails fixed down. I'm going to just try it without epoxy first and see what happens.
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Something like gelcoat then?Quote:
Originally Posted by FatFreddie
Just been to the local fasteners shop so now I can get these rails fixed down. I'm going to just try it without epoxy first and see what happens.
Gelcoat is usually polyester and relatively weak, I was thinking of one of the thixotropic epoxys like the 2015 you originally mentioned - the west system stuff is very good but rather thin for this application.Quote:
Originally Posted by Jonathan
West system + filler perhaps to thicken? Aluminium powder, micro-fibre, micro rubber balls?
If I have this right, one advantage of the filler is that it should create multiple impedance boundaries hence reducing the transfer of some of the vibrations.
My initial idea was to cast one or maybe two full faces on the ali profile as a way of creating a reference plane to aid alignment. I've never done this before but working without a reference plane sounds like a bad idea (?)
In my case bolting the rails directly to the 80x80 box section seems to have worked.
The is a slight amount of binding at one end but I think I can attribute that to the way I've fixed the box section to the gantry. The box section is currently only bolted at the vertical sides which has squashed it very slightly causing the top and bottom to bow, pushing the rails apart. I think If I put some more bolts in it'll be fine.
Nice one Jonathan :)
Got to admit I've become totally OCD about mounting rail, currently investigating using a separate plate and possibly brass threaded inserts to go along with the epoxy, even Mic-6 has almost .4mm variation in flatness :cry: . I'll get there, one day :whistling:
Hmm, it would be interesting to know what variation in parallelness these bearings can actually tolerate. I guess it would be dificult to get a precise number since it will depend on what they're mounted on squashing.
Sure you want to know?
I don't have any info on the round rail or Hiwin HG profile rail but here is the dirt on their older LG rail, see page 29
http://www.automation4less.com/pdfs/hiwinaglg.pdf
anyone thinking of using valuframe... they cant get thair hands on any of the the 40mm x 200mm profile and they will only deliver to a busness... Gutted, time for a re-work
I found a German site that had what appeared to be the ValuFrame range, connectors, everything. The site looked a bit up market, mentioned Aerospace ( = add another 0), but mentioned a UK office. I'll look out the link when I get home.
Link...
http://www.wmh.de/index.php?id=64&L=1
Click Machine Construction, doesn't look like they do 40x200 either, you never know until you ask...
England:
Dagmar Rathbone
UK Sales Manager
WMH UK Ltd
Minerva Mill Innovation Centre
Station Road
Alcester
Warks
B49 5ET
Tel: 0044 1789761365
Mobile: 0044 7970749393
Fax: 0044 1789400447
eMail: Dagmar.Rathbone(at)wmh.de
Could always use 40x160 + 20x40mm solid top and bottom?
Also, when talking to suppliers the word 'protype' sometimes works wonders ;-)