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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Smith rev counter
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<blockquote data-quote="Magnetoman" data-source="post: 176687" data-attributes="member: 2806"><p>If you have a reversible, battery-powered drill, you can look up the manufacturer's specs. My Makita is two-speed, with maximum speeds in the two ranges of 550 and 2100 rpm. The precise values don't matter because they are different enough that it's possible to determine if your tachometer is 1:1, 2:1 or 4:1. Assume the latter to start with and use the low speed. If the tachometer registers anywhere near 2000 rpm, it's 4:1, ~1000 rpm is 2:1, and ~500 rpm is 1:1. After you've determined the ratio, switch the speeds on your drill to confirm your findings.</p><p></p><p>On one of my boxes of Smiths instruments I keep a piece of Al rod into one end of which I've filed a square. I first flick it manually to determine whether the unit I'm about to test is CW or CCW, then install it in my drill and set the direction of rotation accordingly. </p><p></p><p>[ATTACH=full]61073[/ATTACH]</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 176687, member: 2806"] If you have a reversible, battery-powered drill, you can look up the manufacturer's specs. My Makita is two-speed, with maximum speeds in the two ranges of 550 and 2100 rpm. The precise values don't matter because they are different enough that it's possible to determine if your tachometer is 1:1, 2:1 or 4:1. Assume the latter to start with and use the low speed. If the tachometer registers anywhere near 2000 rpm, it's 4:1, ~1000 rpm is 2:1, and ~500 rpm is 1:1. After you've determined the ratio, switch the speeds on your drill to confirm your findings. On one of my boxes of Smiths instruments I keep a piece of Al rod into one end of which I've filed a square. I first flick it manually to determine whether the unit I'm about to test is CW or CCW, then install it in my drill and set the direction of rotation accordingly. [ATTACH type="full" alt="SmithsTester.jpg"]61073[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Smith rev counter
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