some projects

some projects

Joined: December 15th, 2009, 2:25 pm

September 27th, 2010, 7:59 pm #1

piston seal






breech seal


Crosman and Gamo breech seals ready to be cut to size


Spring Guide


Last edited by hotlead on September 27th, 2010, 8:10 pm, edited 1 time in total.
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Joined: February 1st, 2008, 3:28 am

September 28th, 2010, 12:03 am #2

.
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Joined: December 15th, 2009, 2:25 pm

September 28th, 2010, 11:31 am #3

i am using a high performance elastomer. (Polyurethane)
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Joined: October 21st, 2001, 3:36 am

September 30th, 2010, 4:43 pm #4

piston seal






breech seal


Crosman and Gamo breech seals ready to be cut to size


Spring Guide

of making a seal.

It looks like you drill the boss hole, turn to size, face, chamfer and groove(if desired/required) the front and then chamfer the back and part.

Yes?

Last edited by bigbore on September 30th, 2010, 4:44 pm, edited 1 time in total.
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Joined: December 15th, 2009, 2:25 pm

September 30th, 2010, 6:21 pm #5

1st a through hole



2nd arbor up and turn to size



3rd arbor up and chamfer the inside radius



4th part off



5th arbor up again and face and groove and then chamfer the outside radius





Last edited by hotlead on October 27th, 2010, 2:54 pm, edited 1 time in total.
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Joined: October 21st, 2001, 3:36 am

September 30th, 2010, 6:40 pm #6

it's good stuff! The arbor was the trick I was looking for.

Last edited by bigbore on September 30th, 2010, 6:43 pm, edited 1 time in total.
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Joined: December 15th, 2009, 2:25 pm

September 30th, 2010, 6:52 pm #7

notice the end mill in step one is a carbide coated TIALN four fluted.
it is brand new and only cuts urethane.
so for best results dedicated carbide tools should be used for all operations.

Last edited by hotlead on September 30th, 2010, 7:01 pm, edited 1 time in total.
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Joined: October 28th, 2003, 9:58 pm

September 30th, 2010, 7:02 pm #8

i am using a high performance elastomer. (Polyurethane)
And what durometer are you using?

I've turned seals from up to 95A Polyurethane, but they don't seem to hold up past about 13 FPE.

Thanks

Knobs
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Joined: December 15th, 2009, 2:25 pm

September 30th, 2010, 7:57 pm #9

9.5 grain @ a couple ticks under 900 fps with one of my seals.

Redwood Plastics
i like 95a or 50d.

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Joined: February 1st, 2008, 3:28 am

September 30th, 2010, 8:59 pm #10

Is that Redco 80A or 60D polyurethane, the website lists both with an orange color?

http://www.redwoodplastics.com/index.php?content=71
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