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adhesives for Delrin/PTFE

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minerva:
hi guys,
an odd query perhaps, but here goes anyway,
I am currently carrying out some experimentation in the manufacture and use of Solenoids for potential use in an EDM machine.
my first effort using a home-made solenoid was only partially successful, the mechanics proving to be adequate for the job in hand but over an extended period of usage the heat build up within the solenoid was detrimental to the Perspex spool core (slight melt down) Sooooo!, a rethink is necessary. the cheeks of the spool are of  Perspex and were undamaged but the Perspex core was not up to the job. The experts have suggested that a better material would be Delrin or even better PTFE which I intend to try but I pose the question, what if any adhesives will work with these materials - Araldite? Superglue?
I look forward to your thoughts
Terry T AKA Minerva

Bluechip:
Terry
 
Most of the solenoids I've stripped had moulded, one-piece bobbins. No glue problem ....  :thumbup:
I would suggest turning one up from solid, otherwise use Kite brand SRBP, this glues very easily with Epoxy, better to rough the surface with a bit of coarse glasspaper first ..
This is the stuff:
http://www.directplasticsonline.co.uk/TufnolSheet/Kite/
Use the Whale brand for the rods ..
Dave

 

philf:

--- Quote from: minerva on August 28, 2012, 05:02:19 PM ---hi guys,
an odd query perhaps, but here goes anyway,
I am currently carrying out some experimentation in the manufacture and use of Solenoids for potential use in an EDM machine.
my first effort using a home-made solenoid was only partially successful, the mechanics proving to be adequate for the job in hand but over an extended period of usage the heat build up within the solenoid was detrimental to the Perspex spool core (slight melt down) Sooooo!, a rethink is necessary. the cheeks of the spool are of  Perspex and were undamaged but the Perspex core was not up to the job. The experts have suggested that a better material would be Delrin or even better PTFE which I intend to try but I pose the question, what if any adhesives will work with these materials - Araldite? Superglue?
I look forward to your thoughts
Terry T AKA Minerva

--- End quote ---

Terry,

PTFE is very difficult to stick with anything unless the surface is etched which involves seriously nasty chemicals. Machining a bobbin out of solid PTFE might be OK but PTFE isn't the most dimensionally stable of materials and winding the coils would tend to close up the bore. Delrin probably won't fare much better than Perspex as it's temp rating is similar (about 100 C). PEEK is a much better material which can easily handle temperatures of 200 C. What size do you need? - I have some offcuts in my plastics drawer.

Phil

Noitoen:
For a DC voltage coil you can use a thin wall brass tube for the centre of the solenoid and brass sheet for the sides with a soft solder joint. Just insulate it properly on the inside before you wind the coil. You can use Nomex paper to do that.

HS93:
Have a look on this site they do a primer that will suite you plus lots of different adhesives

http://www.fivestardistribution.com/


Peter


Primer 9770 clear surface primer for hard to bond plastics
 
A high power clear surface primer for use on plastsics such as: Polyethylene, Silicone, polypropylene, Teflon ( PTFE ), Delrin and nylons etc
 
In the past many plastrics have been hard to bond, this is due to the surface chemistry of the plastic not a defective adhesive, simply wipe this clear primer on and wait a few seconds and the plastic will then be fully bondable with most adhesives, we reccomend a cyanoacrylate for use with this product for plastic bonding.
 
10ml

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