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Compound Rounds from Sureshot

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: c11man » Sun Jun 21, 2009 11:01 am

soda cans will NOT fit in 2 1/2inch sdr 21. i perosnaly have some sdr 26 and soda cans barley[i] fit inside of t
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Unread postAuthor: MountainousDew » Sun Jun 21, 2009 11:24 am

Sorry, it was a typo...
I know I'll be getting the right stuff anyway, because I'm ordering it from Gort.
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Unread postAuthor: Technician1002 » Sun Jun 21, 2009 11:39 am

FYI, 2.5 inch UMHDPE round stock is oversize and is very close to the diameter of a soda can. :D The round stock is slightly larger in diameter than a soda can. I'll do a fit test in a tennis ball/soda can barrel later. It might be too big without turning down in size.
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Last edited by Technician1002 on Sun Jun 21, 2009 11:42 am, edited 1 time in total.
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Unread postAuthor: thedeathofall » Sun Jun 21, 2009 11:41 am

soda cans will NOT fit in 2 1/2inch sdr 21. i perosnaly have some sdr 26 and soda cans barley[i] fit inside of t


When you say barely, is it too big or too small?
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Unread postAuthor: Technician1002 » Sun Jun 21, 2009 11:44 am

thedeathofall wrote:
soda cans will NOT fit in 2 1/2inch sdr 21. i perosnaly have some sdr 26 and soda cans barley[i] fit inside of t


When you say barely, is it too big or too small?


It is big. I have not tested yet to see if it is too big.
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Last edited by Technician1002 on Sun Jun 21, 2009 8:02 pm, edited 3 times in total.
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Unread postAuthor: thedeathofall » Sun Jun 21, 2009 11:57 am

hmmph.... so then what will they fit in? 3 inch sch 80?
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Unread postAuthor: c11man » Sun Jun 21, 2009 12:43 pm

soda can do fit in almost airtight but you cant even move them (empty) through some pipes. i have 2 peices and one has a slighty smaller id so that is tigher but the other one is perfect and i can move a can just my blowing in it
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Unread postAuthor: dewey-1 » Sun Jun 21, 2009 3:14 pm

thedeathofall wrote:hmmph.... so then what will they fit in? 3 inch sch 80?

Here is a print screen of my pipe id calculator showing 2-1/2 SDR21, SDR26 and SCH80 dimensions verses a Coke Can Projectile.

Image
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Unread postAuthor: thedeathofall » Sun Jun 21, 2009 4:32 pm

Thank you! that helps a lot
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Unread postAuthor: USGF » Sun Jun 21, 2009 7:10 pm

dewey-1 wrote:
USGF wrote:
MountainousDew wrote:Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

SNIP

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...


MD, I'm pretty sure the stock will be oversize. It may be close to 65mm. I checked a soda can here and it is 66mm. SDR 21 in 2-1/2 is supposed to be 2.655" nominal, approx 67.44mm. I'll go over the dimensions with Mike. I know the sched 40 2-1/2" rounds are on the agenda.

EDIT: Hold on, I found the material. It measures approx 65.6mm as it is not perfectly round :?

USGF


I think your ID of 2.655 is the max ID for SDR26 not SDR21 at a 2-1/2 OD.
I get 2.581 nominal ID for SDR21. Min Max range of 2.554 to 2.608 worst case.

USGF Did you try the pipe ID speadsheet?


Dewey, Darn those past midnight posts. I'm pretty sure I made a goof there. The size of the can and the material OD are actual measurements however....

I got the spreadsheet saved, I have not used it yet. Does it have metric conversion built in? You have any charts for common metric pipe specs? If we are to cater to metric customers, we need to make either adapters or metric parts. Thanks

USGF
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Last edited by USGF on Sun Jun 21, 2009 8:06 pm, edited 1 time in total.
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Unread postAuthor: Technician1002 » Sun Jun 21, 2009 8:03 pm

USGF wrote:
dewey-1 wrote:
USGF wrote:
MountainousDew wrote:Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

SNIP

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...


MD, I'm pretty sure the stock will be oversize. It may be close to 65mm. I checked a soda can here and it is 66mm. SDR 21 in 2-1/2 is supposed to be 2.655" nominal, approx 67.44mm. I'll go over the dimensions with Mike. I know the sched 40 2-1/2" rounds are on the agenda.

EDIT: Hold on, I found the material. It measures approx 65.6mm as it is not perfectly round :?

USGF


I think your ID of 2.655 is the max ID for SDR26 not SDR21 at a 2-1/2 OD.
I get 2.581 nominal ID for SDR21. Min Max range of 2.554 to 2.608 worst case.

USGF Did you try the pipe ID speadsheet?


Dewey, Darn those past midnight posts. I'm pretty sure I made a goof there. The size of the can and the material OD are actual measurements however....

USGF

Update, the 2-1/2 UHMWHDPE round stock is too big to fit 2-1/2 inch SDR21 160 PSI PVC Pipe. I just tried it.

This does mean it is big enough to machine down to test rounds that fit like a glove. :D
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Attachments
UHMWHDPE.jpg
2-1/2 UHMWHDPE round stock. I was given a piece.
OD Measure.jpg
Preparing to trim the end in my dad's lathe
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Unread postAuthor: c11man » Sun Jun 21, 2009 8:23 pm

[quote="Technician1002] Update, the 2-1/2 UHMWHDPE round stock is too big to fit 2-1/2 inch SDR21 160 PSI PVC Pipe. I just tried it.
[/quote]

do you mean sdr 26 because sdr 21 is rated to 20psi...
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Unread postAuthor: USGF » Sun Jun 21, 2009 8:45 pm

Technician1002 wrote:Update, the 2-1/2 UHMWHDPE round stock is too big to fit 2-1/2 inch SDR21 160 PSI PVC Pipe. I just tried it.

This does mean it is big enough to machine down to test rounds that fit like a glove. :D


Tech, our large 21" lathe has a 3.5 inch through bore. That material will go through and be machined nice and dandy :D Here it is posed with Grock's 4" piston.

Image
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Unread postAuthor: dewey-1 » Sun Jun 21, 2009 8:47 pm

USGF
I got the spreadsheet saved, I have not used it yet. Does it have metric conversion built in? You have any charts for common metric pipe specs? If we are to cater to metric customers, we need to make either adapters or metric parts. Thanks

USGF


I will work on the spreadsheet to incorporate metric sized pipe as a separate tab/page like you see for copper or aluminum.

Just need some time to research and update data.
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Unread postAuthor: Technician1002 » Sun Jun 21, 2009 11:02 pm

c11man wrote:[quote="Technician1002] Update, the 2-1/2 UHMWHDPE round stock is too big to fit 2-1/2 inch SDR21 160 PSI PVC Pipe. I just tried it.
[/quote]

do you mean sdr 26 because sdr 21 is rated to 20psi...[/quote]


Correct.. Thanks. :oops: It is the 160 PSI PVC.

@Jagerbond.. Nice lathe. It is big enough to do engine blocks. My dad's is configured to make production bolts, screws, flanges, etc. It is much smaller. If my memory is correct it has a 8 inch swing, 36 inch bed and just over an inch through the headstock.

Instead of a regular tailstock, it has a 6 position turrent so repetitive operations can be rapidly repeated. I'll post a photo when I'm at home on the other computer. As a thread cutting lathe, it has the compound gearing, six belt selectable speeds (2 on motor and 3 on the jackshaft) and a full gearbox selector for carriage advance speed/threads/inch. Included is a set of gears to switch to metric.

For excentric jobs such as cams, he has the 4 jaw chuck.

I asked him what he paid for it. Man has inflation run up prices. He bought it used in 1961 for $300.

Edit; Added photos of lathe and 4 jaw chuck. This one is either 8 or 10 inch swing (I don't remember) and has a 1 inch through bore.
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Attachments
Dads Lathe.JPG
My Dad's lathe. Configured for production cutting of bolts, etc. Turrent tailstock and leadscrew transmission for most common thread pitches.
4 jaw chuck.jpg
This 4 jaw chuck and be screwed on in place of the 3 jaw chuck. Each jaw is individually adjustable to hold odd shapes and off set stock to cut cams.
Roundstock facing.JPG
Facing rough cut end of 2-1/2 inch UHMWHDPE stock to show the size of the 3 jaw chuck. This chuck is much smaller than the one at Shureshot. :(
Last edited by Technician1002 on Mon Jun 22, 2009 11:30 am, edited 2 times in total.
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