resin and hardener

[blueyonder]

  i got myself sum casting resin -two and a half liters -half gallon about.

  two small tubs of hardener . but no writing on them. to be honest i forget how much to put in.  ive used fiberglass resin before. it was allways just a few drops to add to resin mix.  but this is for a rotor i am going to cast.  weather is getting cold

 and i will need the right amount. but dont want it getting over hot as its better to ask than just mix it up and see how it gos.

 i also got a small hypodermic thing to add the hardener . its in ml.

   its got 2-4-6=8-10 ml on the side .

   i dont want to wait till xmas to open the mould. its a small amount i know.

  but cant remember doh.   first time i have used casting resin but think it will be ok.                 so is 50 ml resin to one -1 lt hardener look ok.

   that would be 50-1.   so 500lt resin  10 lt hardner? cheers john  

[Flux]

I seem to remember the usual figure is 5%

For large quantities such as castings then that seems far too much. Reducing to 2% would make sense. If you go on the low side it will normally kick the reaction off if you warm things a bit.

I would check these figures, they are from memory and I must confess I have never found ways to measure these small quantities I have been lucky with guesswork so far. I am sure I err well on the low side . I think most of the run away and cracking comes from erring on the high side.

Flux

[warpsta]

My resin and hardener says mix to 2%.

Cheers

[blueyonder]

 well its done. i now have a steel rotor mixed in resin.

 done it in my outside workshop that wasent verry warm  so got a portable gas fire and got it warmed up to 20 deg c. only problem was i was a bit overdressed and soon got a bit hot. so stripping off a few layers . i was more like in my summer gear   it all went verry well  ive mixed and used resin before but only in summer on boats .

  i made two mixes. was hard to say how much i needed to fill mould.

  it was a small rotor 9"  but i am working on cutting two 12" steel discs.

   so this one is just getting me into it.

  looks like i got the mix ok . been a while since i done a bit of glassing.

  but i did panick as i thought resin was  starting to gell as i was putting the bits of glass matting in.   how odd it was all in my mind as the resin dident set for a long time.  

  so it all went well.  so what have i learned.  first i think the steel rotor was still a bit cold.  workshop was warm .as the man says prewarm things first.

  its a bit of 8mm steel so not thin.

   next thing i learned was the brush i was using had a bit steel on it that was being pulled about in my hand as i tried to stipple the glass getting the bubbles out.

  that put me right off my stroke.  but will know about this next time.

   stator will be a bit better to work on (i think)

   got a few pics .but need to wait till towmorrow to open mould.

   at least then i can try testing sum coils on lathe.

   i bet copper wire will be verry expensive. as the price is going up every day.

 its a 9" 8mm rotor with n42 mags 8 of them . just got to try sort out what wire i will need with a 6 foot prop . yes only one rotor but i will give it a go.

    i dident use any talc  i forgot doh.