Jasper Jig setup help

[SLIM3001 10+ year member]

Hi guy's would like a bit of help if you can. I have just got my jig and i know how to use it for cutting out holes but im stuck one the size you pic

RE SUB'S

10" inch = 9.25 cut out but there is no 25 or 2/5 so im lost ?

This i can do no problem

12" inch = 11.1/8 cut out

15" inch = 14.1/8 cut out

18" inch = 16.3/4 cut out

Next is COMPONENTS

OK so im 100% lost now take my components

Lanzar Opti 5.1 & 6.1

Opti 5.1 is a 13cm or 5.25 inch = 122mm thats 4.8 inch cut out but i dont know what i would set the jig at ?.Iknow it would be 4 ?/?

Next is the

Opti 6.1 is a 17cm or 6.5 inch drive = 135mm thats 5.3 inch cut out but againe im lost as to what you seat the jig at.

So if anyone can huck me if with hot to get the size setup i wont that wouldbe cool

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[bjfish11 5,000+ posts]

the 1/8 is one eighth of an inch or .125

.25 equals 1/4 or one forth.

Make sense.

They are listed on the jasper in fraction form, you need to convert the decimal to a fraction.

 

[stayTUNED 10+ year member]

stop taking naps in math class //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

I use a homemade jig, but IIRC that jig is calibrated for 1/4 inch bits so if youre using a 1/2 inch bit you need to make the adjustment

 

[SLIM3001 10+ year member]

stop taking naps in math class //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gifI use a homemade jig, but IIRC that jig is calibrated for 1/4 inch bits so if youre using a 1/2 inch bit you need to make the adjustment

Hi m8 was no good in math when i was at school //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif .

Im using 1'4 bit to cut out the ring's just dont get it lol anyone show me how to do with a calculator ?

 

[helotaxi 5,000+ posts]

0.8" is about 13/16" You just need to get a decimal to fraction chart.