Author Topic: Dissolve broken studs.  (Read 1563 times)

Offline Tippie

  • Hero Member
  • *****
  • Posts: 1773
Dissolve broken studs.
« on: March 02, 2018, 12:47 »
This might help in some cases depending on accessibility etc.
SF2 17483 (race)
SF2 17424 (road)
An Australian living near Oslo in Norway

Offline Piranha Brother 2

  • Hero Member
  • *****
  • Posts: 1145
  • It was once a 1973 SF750
Re: Dissolve broken studs.
« Reply #1 on: March 03, 2018, 04:11 »
Very funky! Quite entertaining as well  :laugh:
What ... leave it standard??!!

Offline Simon Yates

  • Full Member
  • ***
  • Posts: 165
Re: Dissolve broken studs.
« Reply #2 on: March 03, 2018, 09:42 »
Has anyone tried it? 
My brother has a broken stud / stud extractor in his Willys Jeep gearbox.
180 S11 Jota (again)
750 Breganze
1200 Anniversary
180 S11 Jota

Offline Tippie

  • Hero Member
  • *****
  • Posts: 1773
Re: Dissolve broken studs.
« Reply #3 on: March 03, 2018, 10:32 »
As long as the gearbox casing is in aluminium it will work. Tons of testimonials to it on the web.
SF2 17483 (race)
SF2 17424 (road)
An Australian living near Oslo in Norway

Offline Basketcase

  • Full Member
  • ***
  • Posts: 201
Re: Dissolve broken studs.
« Reply #4 on: March 12, 2018, 08:03 »
Used  to use conc nitric acid for steel studs in Al.

Now use a Joemars TR100 EDM since it is harder to get said acid these days for some reason. The EDM only uses tap water. Also good for drilling holes in carbide lathe tool tips.

Offline Basketcase

  • Full Member
  • ***
  • Posts: 201
Re: Dissolve broken studs.
« Reply #5 on: March 28, 2018, 23:07 »
Tap burner in action.

Note to self:

Don't use ball end socket allen keys to remove the ceriani fork screws.

The key tip shears off leaving the hardened steel ball end in screw socket.

A carbide drill would wander destroying the hex socket and the whole screw would need drilling out.

Instead, just EDM with a slightly larger hex brass bar to recreate a hex socket and simply unscrew with a larger key.

The burner uses tap water and the black fluid is the fine steel particles being washed out using a garden hose.

This is why my rebuilds take forever. Every simple task turns into a nose bleed.
« Last Edit: March 28, 2018, 23:15 by Basketcase »

Offline Tippie

  • Hero Member
  • *****
  • Posts: 1773
Re: Dissolve broken studs.
« Reply #6 on: April 24, 2018, 11:25 »
https://en.wikipedia.org/wiki/Electrical_discharge_machining
Just in case anyone else googled electronic dance music.
SF2 17483 (race)
SF2 17424 (road)
An Australian living near Oslo in Norway

Offline Basketcase

  • Full Member
  • ***
  • Posts: 201
Re: Dissolve broken studs.
« Reply #7 on: April 25, 2018, 00:18 »
Here is the hexagonal hole I drilled to use a larger allen key.

A bit on the piss because I only eyeballed the setup.

Offline MotoJouni

  • Sr. Member
  • ****
  • Posts: 353
  • Finland
Re: Dissolve broken studs.
« Reply #8 on: June 02, 2018, 20:13 »
This might help in some cases depending on accessibility etc.

What is the chemical used? I know it was said on the vid but I couldn't understand what he said.
« Last Edit: June 03, 2018, 00:08 by MotoJouni »
SFC 1000 Classic 1989
LB 125 Custom 1986
Ducati Paso 750
And many other old vehicles

Offline Piranha Brother 2

  • Hero Member
  • *****
  • Posts: 1145
  • It was once a 1973 SF750
Re: Dissolve broken studs.
« Reply #9 on: June 03, 2018, 01:29 »
In English I think it's called alum or allum. Not sure what it's proper chemical name is. And I think it's used in dyeing wool!!
What ... leave it standard??!!

Offline Dellortoman

  • Hero Member
  • *****
  • Posts: 10909
  • My wolf mate 6/5/1996 - 3/1/2011
Re: Dissolve broken studs.
« Reply #10 on: June 03, 2018, 02:12 »
Alum https://en.wikipedia.org/wiki/Alum

@ MotoJouni.  If you can't find it locally, you can get it on ebay.
« Last Edit: June 03, 2018, 02:22 by Dellortoman »
Location: Tasmania, Approx 4253S 14723E

Offline scrman

  • Hero Member
  • *****
  • Posts: 1660
  • now part of the sub culture
Re: Dissolve broken studs.
« Reply #11 on: June 06, 2018, 05:18 »
at the the moment using 0.32 lts/sec of alum (aluminium oxide)to promote fertilizer granulation-got a 20000 lt tank if anybody wants some
81 jota-no 4
80 1200-rosie
redax scorch rocket ship
triumph thingy

Offline scrman

  • Hero Member
  • *****
  • Posts: 1660
  • now part of the sub culture
Re: Dissolve broken studs.
« Reply #12 on: June 06, 2018, 05:27 »
here
81 jota-no 4
80 1200-rosie
redax scorch rocket ship
triumph thingy

Offline Cosi

  • Hero Member
  • *****
  • Posts: 4557
Re: Dissolve broken studs.
« Reply #13 on: June 06, 2018, 08:10 »
Yep I'll take a bit
Hastings Point 2489 Australia

Offline Dellortoman

  • Hero Member
  • *****
  • Posts: 10909
  • My wolf mate 6/5/1996 - 3/1/2011
Re: Dissolve broken studs.
« Reply #14 on: June 07, 2018, 02:45 »
at the the moment using 0.32 lts/sec of alum (aluminium oxide)to promote fertilizer granulation-got a 20000 lt tank if anybody wants some

According to Wikipedia, Alum is a sulphate salt of aluminium of typical formula XAl(SO4)212H2O.

Aluminium oxide (Al2O3) is a different animal altogether and is insoluble in water, so won't work as a solvent for broken studs. The stuff you have in that tank must be grains in suspension. It would make a good abrasive blasting medium if you separated it from the fertiliser.
Location: Tasmania, Approx 4253S 14723E