Search found 965 matches

by GeorgeGaskill
Mon Jan 27, 2003 12:21 am
Forum: Casting & Foundry Work
Topic: Calling Harold V - 50Kw induction furnace
Replies: 46
Views: 17152

This is the match plate for the petrobond mold ...

but it's slightly modified to use as a pattern for the fiberglass mold shown in the previous post.
by GeorgeGaskill
Mon Jan 27, 2003 12:18 am
Forum: Casting & Foundry Work
Topic: Calling Harold V - 50Kw induction furnace
Replies: 46
Views: 17152

The left casting was made from a wax ...

pattern which itself was made in the attached fiberglass mold. The molding process is an investment process that uses a colloidal silica slurry which is sprinkled with fine, medium and coarse fused silica in succeeding layers (2 or 3 fine, 2 or 3 medium and 5 or 6 coarse to build up the mold strengt...
by GeorgeGaskill
Sun Jan 26, 2003 10:58 pm
Forum: Casting & Foundry Work
Topic: Calling Harold V - 50Kw induction furnace
Replies: 46
Views: 17152

I am putting this pic here since it is really ...

about casting. These are the last two barrels I cast; the one on the right was No. 3 of 3 cast in Petrobond. The left one is the first one done as a shell mould (remnants are still stuck to the casting.)

Image
by GeorgeGaskill
Sun Jan 26, 2003 10:48 pm
Forum: Gunsmithing
Topic: This post continues the artillery thread from ...
Replies: 31
Views: 11480

This gun is a sister to the one in the pic ...

It's styled after the 1861 8" siege mortar both in barrel and mount but neither is a true model of the original.


Image
by GeorgeGaskill
Fri Jan 24, 2003 8:52 pm
Forum: General Discussion
Topic: And now, this: induction heating on the cheap
Replies: 28
Views: 6040

Yabbut does a 5 kW PA amp cost 5 k$--

judging by the costs of typical 100W stereo amps, this is a possibility.
by GeorgeGaskill
Fri Jan 24, 2003 8:44 pm
Forum: General Discussion
Topic: What all do I need?
Replies: 10
Views: 2323

Looks like you'll have to right click ...

each page plus the images to get html. :-(
by GeorgeGaskill
Fri Jan 24, 2003 7:11 pm
Forum: General Discussion
Topic: And now, this: induction heating on the cheap
Replies: 28
Views: 6040

Ignoring the issue of matching the output to ...

an induction coil, is a 5 kW PA amp a cheap item, even used?
by GeorgeGaskill
Fri Jan 24, 2003 5:41 pm
Forum: Gunsmithing
Topic: This post continues the artillery thread from ...
Replies: 31
Views: 11480

This gun (which isn't mine) is made from ...

a decommissioned high pressure (6000 psi?, 10,000 psi?) gas cylinder cut in half by a cylinder testing company after it failed the visual inspection for recertification. It has a wall thickness of about .75" which is comforting but I have been unable to find any more of these anywhere, even new, whi...
by GeorgeGaskill
Fri Jan 24, 2003 2:22 pm
Forum: Gunsmithing
Topic: This post continues the artillery thread from ...
Replies: 31
Views: 11480

I didn't load for this shot ...

but my GUESS is 6 to 8 ounces. Range was about 900 yards.
by GeorgeGaskill
Thu Jan 23, 2003 10:33 pm
Forum: Gunsmithing
Topic: This post continues the artillery thread from ...
Replies: 31
Views: 11480

This post continues the artillery thread from ...

the Casting & Foundry forum with a repost (with a hopefully brighter version) of the NightFire image.


Image
by GeorgeGaskill
Thu Jan 23, 2003 5:31 pm
Forum: General Discussion
Topic: What all do I need?
Replies: 10
Views: 2323

Here is some reference material for starters ...

http://155.217.58.58/cgi-bin/atdl.dll/tc/9-524/toc.htm

What accessories came with the machine?
by GeorgeGaskill
Thu Jan 23, 2003 4:11 am
Forum: Gunsmithing
Topic: advive on purchase and value appreciated
Replies: 7
Views: 3472

The primary reason people give poor marks ...

to 3-in-1 machines of the Harbor Freight ilk is they are low quality to match their low price. An inexperienced operator is unlikely to be able to do close tolerance work on one; even an experienced user will be challenged. Also, look at the position of the mill/drill head. It is almost on top of th...