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Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Grenadier wrote ...
Use pvc cement to bond the plexiglass
now have to samples ready for testing, fist acrylic superglue, second special transparent glue for PMMA ( it something like chemical welding) after test i will know what to use. last time superglue was able to hold 100Kv in 1cm because my end of multiplier was only 1cm from smps, ( L shape corner from PMMA ) so it will work. after winding all will be filled epoxy glue, so it should work as it should from Voltage breakdown point of view
Registered Member #1667
Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
Grenadier wrote ...
Use pvc cement to bond the plexiglass
perhaps a specialized 2-component acrylate adhesive is a better choice in this case. It polymerizes and produces a perfect connection with the same thermal expansion coefficient
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Pvc cement doesn't harden. Basically it's just methyl ethyl keytone, and this dissolves the plastic a bit. The molecules get all tangled up and it becomes one piece.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
I would recommend against using PVC glue since it has a good amount of dissolved PVC in it which may affect with the solvent weld when using materials other than PVC. They sell pure MEK/TCE targeted for applications like this, it is a little harder to find then normal PVC glue but if it keeps your project from falling apart the extra few bucks is worth it! I have also heard you can get the 'PVC pipe glue' type of formulation (solvent + dissolved plastic) for acrylic as well, but I have never used it so I am not sure how well it works. The idea is that it lets you bond pieces that don't line up 100% correctly so there is a bit of a gap.
You can probably get away using acrylate, and this will definitely be the correct choice if you are using polycarbonate (since it can't be solvent welded like acrylic), but I have found that it is much weaker than a good solvent weld, and very brittle.
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
as always good ideas come too late. After making secondary for 120KV configuration i found way in my box fit transformer that i don't need to replace current CT scanner box, or HV box, so now i will have 65KV transformer with same insulation standards as for 120KV ( so that should give me at least 4x breakdown voltage protection) and transformer fit just with 1mm of free space, if 1mm more, ct scanner box won't be closed in that configuration i have enough amount of BYV26E diodes (2 strings for 100KV 75ns and best of all avalanche rated) so multiplier will be capable 160KV output ( capacitors limit that ) so now have two configuration for hv transformer so back to business i guess
this is how it looks now. after winding, it will be filled with epoxy and 4mm plexiglass covers. that should make a nice transformer :)
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120kv 10-20mA SMPS
