Gallery, Projects and General > The Design Shop

adhesives for Delrin/PTFE

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minerva:
Hi guys, many thanks for the instant replies,
the bobbin in question is  42mm in dia and about an inch between the cheeks with a core dia of 15mm this has a 10mm through the centre to take the armature.
Dave
the srbp route seems a viable option and I think this is the way I shall most probably go
phil
thanks for the offer I will willingly pay the postage if you have an off-cut suitable.
Where does one purchase PEEK?
Noiten
another option I wouldn't have considered thanks
Peter
these adhesives seem to be a bit special and not overly expensive if they are all they claim to be

This morning I had a go at resurrecting  the original coil,  increasing the clearance between the armature and the bobbin and remounting on the jury rig for my EDM prototype (which started life as a portable drill stand.)  It seems to work fairly well but as I have no experience of this type of machine only time will tell how efficient it is. Suffice to say it sank a 3/32" hole about an 1/8" deep in about 1/2 an hour but again the temperature in the region of the solenoid is not good and I know it will have to be replaced sooner rather than later.
Once again many thanks for your input.
Terry T

Bluechip:
Hi Terry
 
PEEK ??? Here ...http://www.directplasticsonline.co.uk/#
 
Click on the top row... PEEK Rod & Sheet
 
PREPARE TO BE TERRIFIED AT THE PRICE   :lol:
 
Can you pie wind the solenoid. ie in sections with a small gap between. There will be less heat build up, you could even fan the thing. Or rewind with a larger CSA wire ??
 
Dave
 
 

BillTodd:
Hmmm  More turns & fewer amps required perhaps?

David Jupp:
One way to 'prime' many plastics for adhesives is to briefly 'wash' them with a gas flame - obviously not for too long!  Note that the primed surface can deteriorate over time, so glue it as soon as possible.

The bond strength may never be fantastic.    Of course take extreme care with regard to fumes - even plastics as simple as Polyethylene can give off noxious fumes if overheated, the likes of PTFE can be fatal !

philf:
Hi Terry,

I'm currently on holiday - I'll look what I have in the way of PEEK when I get home. I may have had some 40mm dia but can't be sure.
 
As Bill has already said, can you not get more turns of smaller diameter wire in at a lower current to reduce the heating effect?

Cheers.

Phil.

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