I have been dabbling in making my own blanks out of epoxy resin and polyester resin. But now i seem to be having a problem. Is there a chemical in the resin which causes the CA glue to set faster? I ask because I have tried inserting brass into 3 blanks and I get the tube installed half way and its set. Can go no further. Would it be better to use a 5 minute epoxy instead of CA when brassing resin blanks? I have no problems with wood blanks.
Inserting brass in resin casting
- Thread starter hornet406
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its_virgil
Member
Two part epoxy is a much better choice for gluing tubes into blanks for several reasons, one of which you mentioned in your post. You haven't experienced these results with wooden blanks because you have not used the wooden blanks that will cause CA to set up quickly, yet. Keep using CA and it will happen. :biggrin:
Cut off the exposed brass tube and glue it into the blank from the other end...using epoxy of course. :biggrin:
I have not experienced CA setting quicker in polyresin blanks ... maybe because of the types of glue you and I use or the humidity of our shops or ... I only use CA when I teach, demo or need tubes to be glued in very quickly and I use thick and an accelerator.
Do a good turn daily!
Don
Cut off the exposed brass tube and glue it into the blank from the other end...using epoxy of course. :biggrin:
I have not experienced CA setting quicker in polyresin blanks ... maybe because of the types of glue you and I use or the humidity of our shops or ... I only use CA when I teach, demo or need tubes to be glued in very quickly and I use thick and an accelerator.
Do a good turn daily!
Don
edicehouse
Member
Maybe a dumb question, but do you try inserting the tubes before gluing to make sure they go in all the way? I have a few times painted/backpainted and then the tubes do not fit in, well go in very hard.
arioux
Member
How long after drilling are you inserting the tube. Heat from drilling stays longer inresin and could activate the glue.
jd99
Member
+1 on making sure the tubes fits first, and I glue my tubes in Acrylic/PR blanks with CA all the time, but I use a slower curing CA that I get from Monty, and I use the thick, I think it's the 750cps or something like that.
I run a bead of glue around the inside of the hole then put some on the end of the brass tube insert and rotate while sliding in and out a couple times then push it to position. Never had one stick halfway yet... knock on wood. :wink:
I run a bead of glue around the inside of the hole then put some on the end of the brass tube insert and rotate while sliding in and out a couple times then push it to position. Never had one stick halfway yet... knock on wood. :wink:
TellicoTurning
Member
I've never had a tube stick in resins, but have had some set up in a wood blank on occasion... but like Ed and Danny, I always try the tubes in the dry holes to make sure they fit properly. I only use the thick Ca from Monty and run a bead on 3 sides of the tube, then rotate and slide it in and out, then reverse it to the other end of the blank and slide in and position.... woods that set the glue quickly seem to be oilier woods like Ebony and some of the rosewoods.
As Don said, it one sticks, just cut off the exposed end and glue into the other end.
As Don said, it one sticks, just cut off the exposed end and glue into the other end.
ED - yes i did test fit the tubes and they slid in easily but snuggly.
Alfred - I had not condidered heat build up. I was inserting the tubes right after drilling. I was figuring a chemical reaction with the CA and the hardener of the resin.
I also apply 3 lines of glue on the brass tube and twist while inserting. Same for the wood. I have only had this problem on the resin. The heat factor makes sense so I will try again allowing the resin blank to cool first. However the last few I tried I used 5 minute epoxy and it worked great. I just let it set about 15 minutes and its fine.
Thanks for all the comments!
Alfred - I had not condidered heat build up. I was inserting the tubes right after drilling. I was figuring a chemical reaction with the CA and the hardener of the resin.
I also apply 3 lines of glue on the brass tube and twist while inserting. Same for the wood. I have only had this problem on the resin. The heat factor makes sense so I will try again allowing the resin blank to cool first. However the last few I tried I used 5 minute epoxy and it worked great. I just let it set about 15 minutes and its fine.
Thanks for all the comments!