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    My New Lathe

    Try warming up the spindle bearings, then remeasure. Should get better. Start at 250 RPM for 20min, then go up to 500 RPM for 20min, and them 1000 RPM for another 20min. Check for overheating before increasing speed. Oh, and make sure the bearings have the proper oil if they arn't sealed...
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    Machining plastics

    Chips not breaking is a big problem with plastics. If you can interupt the cut to make smaller strings that can help. Also clean away the chips often to prevent build up. If you have the room, you can also try a shop vac to pull away the string as it forms.
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    Switches

    That kind of switch is called an "alternate action" switch. Dan
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    Digital Calipers & Pitch Guages

    No, not more accurate, but more usefull. You can set the origin (0.000) at any point, and then measure diferances. Like if you wanted to make several parts all the same size. You would make one part to the required length, and set the calipers to zero on that part, then measure other...
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    Resistor material - flat plate

    I once had a pint of graphite power, but I lost it or through it out. I got it at a marine supply store (west marine). It is used as an epoxy filler. You might also try the graphite used to lube locks. (locksmith shop) Dan
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    Machining Titanium vs Stainless Steel

    Everything you have said is true. The greatest factor is time. Ti has to be cut at much lower speeds, and as you may have heard, time is money.
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    D-Mag o-sink information

    So what you are saying is that copper is too good at conducting heat, and the mag body can't get rid of it fast enough? But aluminium is better because it coducts heat less, so that the mag body isn't overwhelmed? I think a little knowledge is a dangerous thing.
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    a welding question

    you need to add some controlable resistance to the circiut to limit current. You can find large power resistors if you know where to look. OR, you can make your own. The steel strapping that is used to hold cargo to pallets is a good choice. You will need to make good conections, and find the...
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    N cell project: machinist needed

    You should fill out your location in your CPF profile( the country at least), so people know where you are. You might find some one close by willing to help. Many people won't want to get involved if they don't know where you are.
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    drilling steal

    use low speed. You can't go too slow, but if you go too fast you can overheat the bit. Use two drills, one to start, and one to get to your final size. The first bit should be about as big as the center web of the final drill. Take a look at a large drill and you will see that the cutting...
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    Trueing drill chucks

    Drilling is a roughing operation, you won't get precise holes anyway. And .004" isn't too bad unless you are using realy small drills. If you can get a good center spot, then let the drill deflect. Use split point drills, and feed agressively and you should be fine. If you still have troubble...
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    Silly newbie tricks

    Anglepoise has it right in his pic. Daniel has it wrong in his pic. You wan't the direction of feed to be near parellel to the "non cutting" edge of the tool.
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    AL Casting in Graphite Molds?

    I have cast some things in AL before. I used sand molds. You should be fine if you have enough draft in your part. That is that is is tapered for easy relief. You may have to add some taper to the one inch 'stem'. Also, you may have some defects at the top parts of the mold due to floating...
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    A qustion about knurling

    yes they should have the same number of teeth.
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    Spring material with built in resistance.?

    you want NiChrome wire.
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    Knurling

    I just found it in the dorian catalog. p/n 733101-22530 web page And your right, their site sucks.
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    Knurling

    [ QUOTE ] What catalog did you see it in, Dan? [/ QUOTE ] I can't be sure, but probably one from Dorian.
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    Knurling

    [ QUOTE ] NelsonFlashlites said: How do you put knurling on a flat surface that you can't turn on a lathe like a flashlight with a hexagonal body? [/ QUOTE ] There is a knurling tool that is for use in a mill. It holds one wheel and is pressed down onto the work and rolled along. It isn't...
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    Who in the USA has a dang 3mm X .5 tap ?????

    mscdirect.com
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    Drill / Reamer / boring question

    You could ream it. It would only be .020/side. Not too bad. But you beter have a good grip on the body and the reamer. I would bore it. Make two passes. First pass cut most of the way to finish size then measure. Then make final pass to give good finish. The drill is likly to 'catch' and...

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