Comments sought on new build: A CNC Router for RC Gliders and Planes

[Clive S]

Neil I used the Wests System and found it easier to weigh out the two parts with a digital scale rather than by volume and mixing with a flat paddle (strip of ply etc) if this helps. Good luck. ..Clive

[njhussey]

Neil I used the Wests System and found it easier to weigh out the two parts with a digital scale rather than by volume and mixing with a flat paddle (strip of ply etc) if this helps. Good luck. ..Clive

Yes the reactive resins is done by weight, twice as much epoxy to harder I seem to remember....will write it down in big numbers so I can't get it wrong!!! I've got some proper mixing sticks this time...

[m.marino]

Do you have access to a vacuum pump? IF so, you can put the well mixed resin in an over sized container and degas that way (a sealed 50 gallon drum can act as a chamber if the pump can handle the volume). That gets rid of pretty much all gas in the resin which will make for a much better pour and no worry over bubbles. The issue is getting access or having a vacuum pump that can handle the volume.

Michael

[Clive S]

Or a drum that can take a vacuum .. Clive

[Neale]

Just how important is this degassing anyway? I stirred my resin vigorously, let it settle for a few minutes, then poured. I didn't even use the "pour through a small hole" technique. There were some bubbles in the resin as poured, but I paddled a bit of lolly stick back and forth to encourage the resin to find its own level, and also to remove bubbles. The few that were left were very easy to deal with once the resin was hard. It's not something that I'm going to spend much time worrying about when I come to epoxy the gantry rail mountings. For reference, that was using 500g resin/250g hardener on a similar size machine.