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Roller Calculations.

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  • audrey
    replied
    David My old man just spent a couple of saturdays welding in a completely new floor in the evil ford. He did disconnect the battery prior to mig welding the floor, Could this of blown the Alternator,, Audrey

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  • joeby
    replied
    Sorry if I confused you. I cut the bottom off the page, you probably won't need to do it that way. I just spent about 2 hours this morning rechecking roll dimensions on a mold, so trust me, it does work. After a few dozen of these a day, the voices will tell you, you'll be just fine too!

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  • ibewgypsie
    replied
    My 90 ford shop truck got a altenator too. It was knocking like something was wrong with the motor, still charging.. just making a racket.

    I hate noises like that.

    Sometimes you just can't win. On the truck, look for "loose connections. They blow the electronics faster than a short. Anything that "arcs" creates a minature transformer to amplify voltages, to exceed base voltages on transistors and kill them.. Mostly RF thou and Mosfet electronics are mostly affected. A heavy EMF pulse can actually 'KILL" a modern car. A loose wire on a honda 750 used to make me crazy.. I finally found it. I blowed one bulb a day. I didn't have a car back then. ANy welding around a modern vehicle can kill it's electronics.

    David

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  • audrey
    replied
    As for the math wow how confusing. Audrey

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  • audrey
    replied
    I know my husband sure doesnt like his 1989 Ford Pickup. He told me his ford is F------ evil. Today -28 degrees without windchill factor. The ford started OK but another alternator blew again. This will be number eleven being replaced. He has had it checked by numerous garages. No wiring shorts were found, He even ran two extra ground wires to help ground out a old rusty truck, What gives does anyone else have to replace alternators every 6 months to a year"" Audrey

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  • ibewgypsie
    replied
    When I first started programming they didn't have "smart" scientific calculators.

    I saw a construction calculator much simpler than a scientific one ($40). You can enter your formulas in and it runs them like a computer.

    I worked as a engineer for 4 years. I am not that retentive for formulas, I could be asked a question and not know it but five minutes later I did.

    Henry Ford said he had a button on his desk to get answers from smart "expert people" They wanted to take his empire away from him in a sanity case.

    Ha.. I love it..

    David

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  • joeby
    replied
    Hey whaddya know, it worked!
    Sorry about the sloppy penmanship, thats one reason I never made it in engineering. Look it over and see if it's of any help. My final dimensions were off by .0003, probably rounding error.

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  • joeby
    replied
    Audrey,
    Let's see if this works:


    [This message has been edited by joeby (edited 12-20-2004).]

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  • audrey
    replied
    JOEBY please do post a example. I would be very happy to see it. Thankyou Audrey and Old Man Thanks again

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  • joeby
    replied
    Hi Audrey,
    I use roll pin dimensions quite often for grinding shutoffs on injection molds. I don't normally pick a pin diameter to use, I figure out what pin diameter I need because I know what my finished dimension should be. It works either way. I could draw something up for you to use as a reference if it would help. Let us know how you are coming along.

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  • audrey
    replied
    I am NOT doing dovetals,I am grinding a angle to one thousandth tolerance for a die i am building. The tolerances on fitting blocks with angles touching together within .0005 or so are very close. I need to know how to calculate the actual ground angle of the blocks so they bisecct perfectly. Im building a proggressive die with my husband and I hate it, Audrey

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  • Forrest Addy
    replied
    There's no such thing as "easy" shop math; a one step solution to any shop math problem. Some problems are very simple like calculating the tap drill size from nominal diameter and pitch. Some can get quite involved like calculating manufacturing data and change gears for hobbing helical gears. Regardless, a practical understanding of the fundamentals of plaain and solid geometer and trigonometry are part of the basic skills for a machinist.

    Calculating sizes over pins for dovetails measuring is low end on the complexity scale. Any problem you're not familiar with looks insurmountable at first glance but once you've worked through it to a good solution you apply in the shop you'll wonder why you thought it was so tough. Dread and intimidation are by far the greatest obsticals to applying shop math.

    That said, I strongly reccommend the Wofle and Phelps vocational school text: "Practical Shop Methematics." In it you will find most of the common shop math problems arranged as the user would encounter them along with a path to their solution and some practical exercises. It's almost a recipe book for shop math. It come in two volumes. I reccommend Volume 1 as a fixture on your shop library shelf right next to "Machinery's Handbook."

    [This message has been edited by Forrest Addy (edited 12-16-2004).]

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  • Ivy_McNeil
    replied
    Hi Audrey
    I dont know if this is what you are looking for, If not it may come in handy some other time.
    http://img.photobucket.com/albums/v6...llPinChart.jpg

    Regards
    Ivy

    <font face="Verdana, Arial" size="2">Originally posted by audrey:
    Sheesh. Does anyone have a simple easy painless way of calculating a roller (One half Inch Diameter )Dimension. I mean a angle machined onto a part. Then you are supposed to use a half inch diameter(for example) roller(Tooling Dowel Pin) up against the edges and do mathematics and with a height gauge check your final dimension for accuracy. Wow we never learned that one in the one year college course I took. Any help gentlemen would be greatly appreciated. Thankyou Audrey</font>

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  • nheng
    replied
    Audrey, This may be what you're looing for:

    http://www.homemetalshopclub.org/news/dec02/dec02.html

    Just scroll down.
    Den

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  • mklotz
    replied
    Audrey:

    It's difficult to understand from your original post what you're trying to
    calculate.

    Can you post a picture of what you're trying to calculate? If you can, I'll
    take a stab at deriving the formulae you need.

    Regards, Marv

    Home Shop Freeware - Tools for People Who Build Things
    http://www.geocities.com/mklotz.geo

    Leave a comment:

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