Needs Pictures: 0
Results 16 to 25 of 25
Thread: Quick small vac pot
-
3rd June 2021, 08:03 PM #16Senior Member
- Join Date
- May 2009
- Location
- NSW
- Posts
- 489
I think I will investigate the ins and outs of making some sort of viewing window in the domed lid, or perhaps look for a tall and skinny container of suitably stout construction. I will assume that the smaller the opening then the thinner the PC sheet can be? If that is so then the cylinder can be tall and skinny and hold material stacked on end rather than side-by-side? Who knows what silly ideas I might come up with?
-
3rd June 2021 08:03 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Posts
- Many
-
3rd June 2021, 08:29 PM #17.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,795
For a simple long skinny vacuum pot a length of PVC sewage pipe can be used on its side, with push fit cap glued on at one end and a screw capped coupler as a lid.
Stuff can be slid into the tube on long trays
If you have several days of free time there are heaps of these on youtube, including loads and loads of fails.
I personally wouldn't use PVC for long term use as it is likely to eventually fail no matter what you do.
-
4th June 2021, 01:05 AM #18GOLD MEMBER
- Join Date
- Aug 2007
- Location
- Saskatoon, SK, Canada.
- Posts
- 1,439
If you are not drilling the top have you considered tempered glass? It's possible a glass shop might have a thicker piece. These are bigger than you need but the price is right.
Round Table Top Tempered Glass Chopping Board Multiple Size 10-12mm thick | eBay
Pete
-
4th June 2021, 05:30 AM #19Senior Member
- Join Date
- May 2009
- Location
- NSW
- Posts
- 489
I had thought of using glass and some vacuum chamber manufacturers do use it but I worry about what will happen if the stuff fails when under vacuum. Will it just crack or will there be a massive implosion with bits of glass flying all over the place? I sort-of like the idea of a gradual and dignified failure rather than a newsworthy major disaster.
-
4th June 2021, 06:08 AM #20GOLD MEMBER
- Join Date
- Aug 2007
- Location
- Saskatoon, SK, Canada.
- Posts
- 1,439
You trust tempered glass a foot from your ear every time you get in your car and it is half or less as thick. Glass shops can get it thicker but there is a cost.
Pete
-
4th June 2021, 07:30 AM #21Senior Member
- Join Date
- May 2009
- Location
- NSW
- Posts
- 489
And it shatters really easily, that's why I don't trust it for a vacuum chamber. I have a friend who is a locksmith and his experience fitting locks to glass doors reinforces my fear of the stuff.
-
4th June 2021, 08:29 AM #22.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 27,795
At work we used many gas plates as vacuum chamber covers. It doesn't make much difference, but the vacuum was about 0.000000001 atm
The old ones were pain 3/4" thick plate glass covering a 120mm opening. If these broke under vacuum it was not a good thing. I was not there but one did break - no one was injured but glass was scattered all over the lab.
Because of this we switched to plates made of two 6mm plates of safety glass sandwiching a 1mm layer of silicone. We broken a number of these, once it was under vacuum but it was a non-event. The glass cracked and the silicone prevented it from imploding just long enough so the vacuum is released. Other plates were dropped and once a student dropped a spanner on one cracking it. We used to buy this glass from a regular glass supplier. You can make your own silicone sandwich plate from oven door glass plates. Better still would be sandwiches from tempered glass and PC, glass on the inside of the chamber so fumes won't worry it and PC on the outside for safety.
An alternative is to use a mesh guard to cover the glass plate. We had several 15L glass bell jars that were used under vacuum covered with steel mesh made of 1mm thick steel perforated with 1/4" holes with a 1/4" spacing. It was surprisingly easy to see through. This prevents the glass getting a hard knock while under vacuum which is when they are most likely to break.
I've worked with PC and glass in and around labs and workshops for many years and this is why I like PC.
As I get my PC for free, if the fume eventually fog it My intention is to just replace it.
-
4th June 2021, 10:17 AM #23Senior Member
- Join Date
- May 2009
- Location
- NSW
- Posts
- 489
So what sort of silicone did you use between the glass plates? I need to be able to see through the glass to be able to observe the off-gassing of the timber so the "juice" doesn't boil over and mess up the internals of the pot or get sucked into the vacuum pump. Was this ordinary silicone suitable for glass or something more specialised?
-
4th June 2021, 12:34 PM #24Senior Member
- Join Date
- Feb 2018
- Location
- Ipswich
- Posts
- 103
An A3 sheet of 12mm PC is $24 here
300 x 300 $17
-
4th June 2021, 12:52 PM #25Senior Member
- Join Date
- May 2009
- Location
- NSW
- Posts
- 489
That was so cheap I ordered 2 @300x300! But I have plans for another chamber so I might as well save on postage. Thanks for the research!
Similar Threads
-
The workhorse that is a bench, small workshop answer for those with a small space
By rwbuild in forum WOODWORK - GENERALReplies: 3Last Post: 25th May 2021, 12:13 PM -
Small Baltic Pine table, with a small QLD walnut tray.
By LGS in forum WOODWORK PICSReplies: 1Last Post: 2nd November 2017, 10:02 PM -
What I did last week - quick build quick canoe?
By Boatmik in forum Michael Storer Wooden Boat PlansReplies: 4Last Post: 9th August 2010, 11:14 AM -
Quick ! Quick, ya Stanley collecting freaks..a stanley # 1 !
By JDarvall in forum HAND TOOLS - POWEREDReplies: 29Last Post: 17th March 2006, 09:17 PM