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posted by: wood-n steel
The Machinists vice is built to much
closer tolerances when bolted down to the bead of a machine The fixed jaw
will be perpendicular to the bead and the base will be parallel to the
bead. It is used fore machining. Whereas the mechanics vise is used to
hold parts while you beat the living **** out of them or weld sump thing
or put the torches to that part that wont come apart.
 posted
by Cutter 02-26-2004
If you read the descriptions, the
machinist's vise is stated to be twice as strong
as the mechanic's, several differences like that.
posted by: OlPilot
On that web page that Franz previously
referenced for vises, note that some are listed at 30 ksi tensile, others
at 60 ksi. The 30 ksi ones are sorry-assed cast iron. Just try beating on
the anvil of one for any length of time with your sledgeomatic and see
what happens!
The 60 ksi vises should at least be cast steel. But it's not just a
question of tensile strength differences here, there's another
metallurgical parameter to consider called fracture toughness. Fracture
toughness is measured on V-notched samples using a Charpy impact tester.
Cast iron, with all the carbide precipitates in it, is brittle. It's hard
and is wonderful in compression, but not in tension or where impact or
cyclic loads are applied.
Some years ago, I had a problem with planetary gear trains failing in
DC-10 lower belly compartment cargo power drive units. I called the
manufacturer in Germany and asked their chief engineer what material he
had selected for these small and very highly loaded gears. "17-4 PH" he
replied. "Thomas", I said, "When was the last time you checked
MIL-Handbook-5?" "Why", he said. "Well", I said, "If you don't heat treat
17-4PH (a precipitation hardening stainless steel), you've got peanut
butter. If you do heat treat it, you've got glass. Neither one is suitable
for impact loaded gears." I got him to change the material to a 300 series
steel. Expensive and harder than the hubs of hell for wear resistance, but
it also had fracture toughness. The problem went away.
Maybe someday the Chicom manufactures of drill bits, vises and such will
learn that just because something looks the same, it ain't necessarily so.
When they do wake up, and change to better materials, the prices are bound
to go up.
---------------------------------------------------
I remember when sex was safe and flying was dangerous.
posted by: Newb
Well, based on everyone's feedback, I
started pickup up the weekly newspaper to find a vise.
Found a local auto repair guy going out of business.
This is what I got (film getting developed, will post pics when I get them
back).
4 vises, 1 a Reed that opens about 12", 2 Columbians 1 opens about 7" and
one about 5", and one old Wilton that opens about 11". Also got a box of
exhaust clamps and hangers. Older Baldor 6" benchtop grinder.
Total cost was $100. I'm jacked up. Thought I'd share to let you know the
deals are out there. So don't give up.
____Newb's signature_______________
I am a total newbie.
posted by: Franz
Newb, look in your rearview mirror for
flashing lights, the cops might be on you for highway robbery.
The Columbians are Wilton's second line, like Blue Point is Snap-On's
second line.
Reed is an old machinery manufacturer.
You scored a lifetime supply of vises for $100-, now all you gotta deal
with is the hernia you got runnin off with them.
____Franz's signature_______________
Will the last weldOr leaving the Hobart board please turn off the lights.
posted by: Banzaitoyota
DAMN!!!! Good deal, I'll give you 40
for one of them.
____Banzaitoyota's signature_______________
Hobart Handler 175
75/25, argon and Tri-Mix
Mazda Rx-7's, RX-4 and a 3 rotor 20B
92 Dodge D250 CTD
Kubota G1800
New Holland TC35D
posted by: Newb
Thanks Franz and thanks Banzaitoyota.
Will post some pics when I get them. Banzai, wait till you see the pics,
then let me know if you want any.
posted by: Trevor
lets see some more pics of this vice
after ELECTROLYTIC derusting and of those vices you got at the sale newb
posted by: Newb
I'm getting my pics back tomorrow, so
will post 'em up. They ain't pretty, but they will definitely last longer
than I will or any of those chicomwaneeseposjobs out there.
Maybe TSP would work too for those of us that don't have the knowledge for
electolysis. I didn't do that though. I just wiped 'em off and figured
I'll use them as is.
posted by: Franz
TSP is a non contestant.
For electrolytic cleaning the electrolyte is Sodium Silicate.
posted
by Cutter 03-07-2004
Old man Wilton got dunked into the vat
yesterday and started on the road to recovery, I hope.
This picture shows the results after about 18 hours into the rust removal
process. Nastier looking
than anything I've done before, but then this was a really rusty old vise,
too.
posted by:
Hickey
Looks like some good soup. Will this
process remove chrome too?
posted by: Mike W
You can add acid to water to speed up
the process and take off chrome also.
posted by: Newb
Mike, what type of acid and how much?
That looks like a nasty dish my wife would try serve up.
posted by: Franz
BOYS, do NOT add acid to this process,
acid will neutralize the electrolyte.
Cutter the tank looks about right, and I hope you remembered to do it in a
well ventilated area.
Come to think of it Cutter, it would be better if you just crate that vise
up and ship it to me so I can give it a decent burial at the end of a
bench.
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