Jump to content


Photo

Bentonite clay


  • Please log in to reply
39 replies to this topic

#31 Guest_PyromaniaMan_*

Guest_PyromaniaMan_*
  • Guests

Posted 28 April 2006 - 10:02 PM

I am not very electronically capable, but the way I understand the thyristor is to imagine the 'sine wave' of AC current. The thyristor, when a certain point of each positive and negative parabola is reached, cuts off the current. This results in parabolas with a shaved off edge, thus reducind the current.

I am sure your other ideas would work too, in fact when looking for ways to reduce the RPM of the motor I found that one person was just going to add loads of lightbulbs in series!

This information is not guaranteed to be correct, but the general jist is that the thyristor works, how well it does so, I cannot judge!

Regards

#32 fishy1

fishy1

    Name

  • General Public Members
  • PipPipPip
  • 659 posts

Posted 28 April 2006 - 11:15 PM

if anyone is really desparate for bentoite clay (cat litter), i could send you some if you pay P@P and ?1 for 1kg.

pm me if you want some.

don't expect a quick reply, as i have exams atmo.

Edited by fishy1, 28 April 2006 - 11:17 PM.


#33 jcow

jcow

    master of disturbing neighbours

  • General Public Members
  • PipPip
  • 45 posts

Posted 30 April 2006 - 09:59 AM

Just going back to the bentonite problem, I use plaster of paris for making rockets and salutes. I wet the powder slightly and mix(about 1:6 water to plaster of paris by volume). When this is rammed into a tube well by hand, it is strong and light. It isnt as good as bentonite, but it is cheaper and available from most chemists in the UK. the plugs can crumble if the tube is crushed. Adding more water and leaving to dry overnight would produce a much stronger plug, but i dont have the patience for this!

#34 Andrew

Andrew

    Rocket Scientist, no really, I am!

  • General Public Members
  • PipPipPip
  • 603 posts

Posted 01 May 2006 - 08:38 AM

Finely powdered bentonite clay is available for a couple of quid per kilo, I would probably expect the chemist's prices to be a lot higher, PM me for source.

#35 Zinginex

Zinginex

    Member

  • General Public Members
  • PipPip
  • 155 posts

Posted 02 March 2007 - 09:23 PM

I used cat litter for a fountain the other day and i rammed it ok ( the rammer was slightly smaller ID than the tube :( ) but i found that the choke was blocked up after the fountain had ignited, by the looks of it, of melted cat litter. I may be wrong but just wondering if anybody had this before. Also i just looked on ebay and found many listings of bentonite clay powder being sold for less than 10 quid. Don't know if this is a rip off but it seems alright for bout 500g.

Edited by Zinginex, 03 March 2007 - 08:39 AM.


#36 Andrew

Andrew

    Rocket Scientist, no really, I am!

  • General Public Members
  • PipPipPip
  • 603 posts

Posted 02 March 2007 - 10:40 PM

Don't know if this is a rip off but it seems alright for bout 500g.


Divide that by five and then it would be reasonable.

#37 Zinginex

Zinginex

    Member

  • General Public Members
  • PipPip
  • 155 posts

Posted 02 March 2007 - 10:43 PM

Divide that by five and then it would be reasonable.


So your saying this is 5 times better than a reasonable price?

#38 fishy1

fishy1

    Name

  • General Public Members
  • PipPipPip
  • 659 posts

Posted 02 March 2007 - 10:53 PM

So your saying this is 5 times better than a reasonable price?


He says it's 5 times worse, even £2 for 500g is steep, I get mine for £2 for about 15kg. I use alot of it though for furnaces.

#39 BrightStar

BrightStar

    Pyro Forum Regular

  • General Public Members
  • PipPipPip
  • 900 posts

Posted 03 March 2007 - 08:33 AM

I used cat litter for a fountain the other day and i rammed it ok ( the rammer was slightly smaller ID than the tube :( ) but i found that the choke was blocked up, by the looks of it, of the cat litter. I may be wrong but just wondering if anybody had this before.


Yes, annoying isn't it :angry: I made up three small fountains a while back using ground cat litter nozzles, hand drilled, and by the time I had transported them to the display only one would ignite. The other two had become completelely blocked by the crumbling clay.

Try the fine bentonite powder from Inoxia - it consolidates much better and doesn't crumble nearly as much in use. You can also wax treat your clay. Adding 5% paraffin wax (shaved candles will do) dissolved in Coleman Fuel (purified gasoline - beware the major fire hazard) and drying before use will make it more workable.

Edited by BrightStar, 03 March 2007 - 08:42 AM.


#40 Zinginex

Zinginex

    Member

  • General Public Members
  • PipPip
  • 155 posts

Posted 03 March 2007 - 08:37 AM

Yes, annoying isn't it :angry: I made up three small fountains a while back using ground cat litter nozzles and by the time I had transported them to the display only one would ignite. The other two had become completelely blocked by the crumbling nozzles.

Try the fine benotonite poowder from Inoxia - it consolidates much better and doesn't crumble.


Yeah it was :angry: I might buy some of ebay as my dad won't let me buy anything else of the internet except on ebay :glare: I know that it might not be of the best quality but that's all i can do :D

He says it's 5 times worse, even £2 for 500g is steep, I get mine for £2 for about 15kg. I use alot of it though for furnaces.


Oh ok thanks




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users