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Type: Posts; User: Jpfalt

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  1. Replies
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    6,343

    The issue of concern with mercury is not...

    The issue of concern with mercury is not necessarily a nuclear one.

    The issue in the nuclear industry is formation of low melting point eutectic alloys that cause rapid, premature low...
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    Check out Protomold. http://www.protomold.com/

    Check out Protomold.

    http://www.protomold.com/
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    1,877

    How about "Free-Range Lathe"?

    How about "Free-Range Lathe"?
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    The best thing you can do with cold roll is to...

    The best thing you can do with cold roll is to anneal it first and then machine.

    If you don't already own the material, then get hot rolled stock. Cold roll material squirms like a snake whenever...
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    5/8-18 is the standard United National Fine (UNF)...

    5/8-18 is the standard United National Fine (UNF) thread. It's not surprising to find a toolholder with that thread.

    The 5/8-16 is a special thread and probably was standardised by the drill...
  6. Thread: straight holes

    by Jpfalt
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    4,643

    The optical method is probably the most reliable,...

    The optical method is probably the most reliable, but takes some skill to master.

    You could also use a pin in the bore with one end perpendicular and mirrored. You shine a laser down the bore and...
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    One way to do it is with two slides at slight...

    One way to do it is with two slides at slight angles and a table between the two. A machine for grinding large radius arcs is here:

    tension gage grinder

    The two bars pivot at the ends of the...
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    I got pasted on this issue last year over Logan...

    I got pasted on this issue last year over Logan manuals. I bought a set from Logan and have been happy with them. Unfortunately, they don't like me.

    From the strict standpoint, a book or manual...
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    I have a similar saw that takes a 12" blade and...

    I have a similar saw that takes a 12" blade and runs at 1500 rpm.

    It's made for cutting rebar, structural steel and so on. I've been really pleased with the quality of the cut surface. The key...
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    You might try googling "brush plating". The...

    You might try googling "brush plating". The process is used to locally build up areas of shafts or slides to estor dimension. A nickel brush plate can be applied up to about a 16th of an inch and...
  11. I use Harris Welco 17FC nickel silver brazing...

    I use Harris Welco 17FC nickel silver brazing rod. 80,000-100,000 psi tensile and easily machinable. I have yet to have a repair break with this material.
  12. Those patterns are actually a business...

    Those patterns are actually a business opportunity.

    Sets of castings to make scale models and old equipment are available from several sources ranging from $50 up to thousands depending on the...
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    We've got cougars in Oregon that regularly...

    We've got cougars in Oregon that regularly harvest a jogger now and then down by Eugene (approx 60000 pop). We usually get 2 or 3 reports a year of cougars coming into the suburbs around Portland...
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    First of all, 3000 rpm on a weedwhacker is below...

    First of all, 3000 rpm on a weedwhacker is below a low idle speed. Most run around 7000 to 10,000 rpm at wide open throttle and idle between 3500 and 4000 rpm.

    The function of the grease is to...
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    6,718

    No go on heating in an inert atmosphere. The...

    No go on heating in an inert atmosphere. The problem is that tungsten carbide tools are more like concrete than metal. There are hard bits of tungsten carbide with a metal filler between them, like...
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    Years ago I heard about a process for alloy...

    Years ago I heard about a process for alloy identity testing using an eddy current tester. At the time it also said that eddy current testing could also identify hardness variations for a consistent...
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    I wonder if a parking revetment would work. ...

    I wonder if a parking revetment would work. Basically put in a pair of short concrete walls just far enough apart to get the equipment in between. You can't get the tires off if you can't get to...
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    How much of the material do you have and what...

    How much of the material do you have and what size is it?

    I use wrought iron for blacksmithing projects, specifically laminated plane blades and Japanese style hard faced handles. Drop me an...
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    The cosest thing I have seen to what is asked for...

    The cosest thing I have seen to what is asked for is the welding certification program of AWS. You see welding schools all over and typically the people who are card carrying welders have at least...
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    9,924

    The cosest thing I have seen to what is asked for...

    The cosest thing I have seen to what is asked for is the welding certification program of AWS. You see welding schools all over and typically the people who are card carrying welders have at least...
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    EBay periodically has large rare earth magnets...

    EBay periodically has large rare earth magnets listed. One of them is a disk 5 inches in diameter and 2" thick with about 1600 lbs of pull. The shipping instructions include a warnign to have no...
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    Cost of lathe - $3950 Cost of collet closer -...

    Cost of lathe - $3950
    Cost of collet closer - $675
    Cost of the pennys - $.02

    Cost of the look on your face when you flip it and the other guy calls "heads" - priceless
  23. I've had a couple of suspicions about work zones...

    I've had a couple of suspicions about work zones around here.

    You're driving down the road, there are cones and barricades on the shoulder, a sign saying "Work Zone - traffic fines doubled" and...
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    I have done complex shapes on the lathe using a...

    I have done complex shapes on the lathe using a template and dial indicator. The shape was cut into 1/8 sheet and clamped to the lathe bed so that it was behind the cross slide and above it by about...
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    You will definitely have less warpage and lower...

    You will definitely have less warpage and lower residual stresses with the braze using an OA torch. The reason is that you are heating a larger area more slowly, which lets the heat move through the...
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