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Air Gun Home Forum Index » Airgun Smithing » Masking Tape
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Masking Tape 
PostPosted: Wed Mar 18, 2009 12:21 am Reply with quote
Slavia
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This is going to seem trivial for you guys with lathes and band saws. For those of us who view a vise and hacksaw as a "stationary machine tool," here goes. While working with steel water pipe (muzzle brake for my Mendoza), I used these techniques for layout:

To cut tubing square (or to locate holes in a line perpendicular to the bore) I wrap masking tape around the tube. Pull the tape snug from the middle only, so one side won't stretch. Wrap all around the tube, until the tape wraps over where you started. If the edges meet, it will be pretty close to square. If not, try again:


To draw a line straight down the length (parallel to the bore) find something flat and about half the diameter of the tube. Hold the tube against it and use the block as a straight edge:


To space holes evenly around the tube (in my case, three setscrews 120 degrees apart) wrap a piece of tape around the tube until the ends overlap. Cut the overlapping ends so the tape is a ring with the ends just meeting:


Then remove the tape, transfer it to a piece of wax paper or parchment paper, and locate the holes with a ruler or caliper (every half, third, quarter, etc.) Then put the tape back on the tube.


It is also possible to use permanent marker as layout ink, and then scribe or scratch a line through it. I like using tape because it gives a place to write down measurements, etc.

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PostPosted: Wed Mar 18, 2009 1:21 am Reply with quote
kanyon
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Thats not silly....lay yer patten out on the tape before you put it on.
Thats pretty kool idea....Cut yer bit if tape to the right length to go around.
.....Dia X 3.1415927 = ?
Its now stored in the top 4" for future use.
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PostPosted: Wed Mar 18, 2009 9:16 am Reply with quote
yourdaddyjoe
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Uncle Slavia, Are you kidding? Tape is the way to go!

I still don't have a rotary table or indexing tool... Even with the lathe I still have to hand lay out every thing... especially when I port a brake...

CD Cases make a great straight edge....

Sometimes I feel like a treasure hunter laying out grids using my dividers to keep every port asymmetrical.

Good job my friend!
Mr. Green

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PostPosted: Wed Mar 18, 2009 11:10 pm Reply with quote
Amigo
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Another short course in practical engineering from Slavia:!:

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Masking Tape 
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