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| Jasper Metric Bits Conversion Application |
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Pivot Hole Value Calculator
for Metric Bits and Circles
(Models 200, 270, & 400) |
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| The metric resolution of the Jasper Circle Guides Models 200, 270, and 400 is 1.59 MM.
Maximum accuracy will be achieved by using a 6.5 MM bit. The following calculator will
give you the next largest pivot hole that is calculated. If the Actual Diameter is 1.59 MM or
more larger than the Desired diameter you can subtract 1/16 inch from the Pivot Hole
Value. |
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| To Make a Metric Cutout |
| Pivot Hole Value = |
| Cutout Diameter (MM)- Bit Diameter (MM)+ 6.35 |
| 25.4 |
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| Enter bit diameter and cutout diameter in following blocks and select “Calculate”.
Read Use This Pivot Hole and Actual Cutout Diameter below. |
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| To Make a Metric Disk |
| Pivot Hole Value = |
| Disk Diameter (MM)+Bit Diameter (MM)+ 6.35 |
| 25.4 |
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| Enter bit diameter and disk diameter in following blocks and select “Calculate”.
Read Use This Pivot Hole and Actual Cutout Diameter below. |
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| Butterfly Template |
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| Circle Guide |
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| Base Plate |
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| Accessories |
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Guide bushing shown in the picture
does not come with the plate |
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