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JSR wants a lathe/mill thread -> JSR buys Sherline

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: inonickname » Sat Jun 25, 2011 5:51 am

Depends, how long are those bars? :wink:


I'd pick up a piece of HDPE rod stock too, you'll like it, I promise :wink:
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 25, 2011 5:57 am

inonickname wrote:Depends, how long are those bars? :wink:


The 18mm brass bar is 1 metre long, half a metre of 20mm aluminium, similar length of 16mm brass, the rest of the length you can see in the photo.

Without postage, one metre of 20mm brass barhereis over $90, so I definitely got a better deal than someone in the UK :D

Still looking for a local HDPE supplier.
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Unread postAuthor: LeMaudit » Sat Jun 25, 2011 8:02 am

Here's a little knife I just made

Ohhhh! Very nice!!!

he 18mm brass bar is 1 metre long, half a metre of

Well, that's not an outrageous price... not cheap either. Metal IS expensive. My convenient supply for 12mm diameter brass was big bolts, until I found some local supplier.
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Unread postAuthor: jackssmirkingrevenge » Sat Jun 25, 2011 9:04 am

LeMaudit wrote:My convenient supply for 12mm diameter brass was big bolts, until I found some local supplier.


There's a scrap yard not far from where I work, need to check it out.
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Unread postAuthor: inonickname » Sat Jun 25, 2011 9:31 am

LeMaudit wrote:
Here's a little knife I just made

Ohhhh! Very nice!!!

he 18mm brass bar is 1 metre long, half a metre of

Well, that's not an outrageous price... not cheap either. Metal IS expensive. My convenient supply for 12mm diameter brass was big bolts, until I found some local supplier.


It went fairly smoothly... until I was drilling the handle out and the drillbit snapped...it gave me fits. I ended up heating the handle up and dunking it in oil to make the drillbit brittle, then smashing it with a hardened rod and banging it out. Might try a smaller knife or a more intricate design soon.. Suggestions?
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Unread postAuthor: jackssmirkingrevenge » Fri Jul 01, 2011 6:28 pm

Now that I have some experience with my lathe, here's a design for a hybrid cartridge that is about as simple as I can think to make it with a burst disk.

There is no pump connection on the valve because the entire cartridge is intended to be placed in a fill chamber.

The epoxy base is essential to insulate the valve from the body to allow the spark to arc across the gap.

I would be more inclined to make a "valveless" cartringe with an adjustable o-ring detent that can hold the projectile at mix pressure but not at ignition pressure.
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Unread postAuthor: warhead052 » Fri Jul 01, 2011 6:42 pm

Awesome! Your is going through with the hybrid cartridges! These will be very cool to see when they are completed.
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Unread postAuthor: LeMaudit » Fri Jul 01, 2011 8:33 pm

First I know nothing about hybrid and cartridges... but... I want to learn!
In the meantime this little ball just waiting to fall down was bothering me.

So here's my process of thoughts:

1) Over-engineered just as I love it. More fun to machine too ;-)

then I thought... threads are not JSR's best... :P so... let's remove them!

2) Why not using a o-ring simply to tighten the disk around?

3) and 4) are just variations with a ring helping the compression.

5) And then :idea: ... why not a simple piece of adhesive tape? Too ghetto? Surely it has been done before! :lol:

Oh well... a little fun after a very long day at work.
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Unread postAuthor: Zeus » Fri Jul 01, 2011 8:55 pm

If I might ask the lathe gurus, I'm looking at the plain 4100 series, the asking price here is $1,639.00

Is that a total ripoff? Also, if I had such a lathe, could I put on the 17" bed? I believe they are modular, but how much I don't know.
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Unread postAuthor: warhead052 » Fri Jul 01, 2011 9:00 pm

LeMaudit wrote:
5) And then :idea: ... why not a simple piece of adhesive tape? Too ghetto? Surely it has been done before! :lol:


I did it with packing tape and my pvc hybrid... Stupid me I know, but it was really loud.
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Unread postAuthor: LeMaudit » Fri Jul 01, 2011 9:22 pm

You want the small lathe? Short bed, you sure?
Thefactory price is $US 575

So yes, if your talking $US and without accessories, it IS a total ripoff.

Check the price at Sherline Direct, and a honest retailer in the US will give you about 10% lower because Sherline make very good prices to its retaillers, and if they are not too greedy they will pass the savings on you.

Going from 8" to 17"... I guess you could... but you're aware that for $1200 you have the long lathe full equipped, the whole shebang, right?

if I'm not mistaken you'll have to change the leadscrew $30, the base $84 and the bed $150. I think the rest you should be able to keep. But you should call the factory and confirm that. I'm really not 100% sure.

Here's an exploded view with all the pieces and their references to find them at their web site. That's what I used to give you those few prices. Enjoy!
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Unread postAuthor: evilvet » Fri Jul 01, 2011 10:52 pm

And on the subject of TOTAL rip off

LeMaudit wrote:You want the small lathe? Short bed, you sure?
Thefactory price is $US 575


Try http://lathesonline.com.au/estore/index.php?main_page=product_info&cPath=1_2_3_80_81&products_id=343&zenid=b23fe3bc2ca01a44a95d4cb1151ceb22 $1,642.00 How much can FCL freight from the US be ?

Given a 1.07/1.00 AUD/USD how on earth can that be justified. Sieg N1 or C1 are about all you can get for $500.

Anyway, my lathe spending got blown this morning on http://www.bikes.com.au/p/1208638/2011-mbc-ultra-r1---save-1200.html :D

Funnily enough it seemed to blow the Wife Tolerance Budget as well...... :roll:
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Unread postAuthor: Zeus » Fri Jul 01, 2011 11:32 pm

Well I'm in Australia, how would shipping from the US be? I daresay less than this place.

If I can upgrade the 8 inch, I'll go with it, as my plans are quite small, and far more dependant on a mill. I "should" be able to get one early next year, and adding on another $400 max to go 17" won't be too bad.
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Unread postAuthor: evilvet » Fri Jul 01, 2011 11:40 pm

Find a couple more of us in Oz and split an LCL, domestic shipping once here would not be prohibitive ?
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Unread postAuthor: Zeus » Fri Jul 01, 2011 11:46 pm

I concur, though as I said I'm a while off, and that guess is tentative. But certainly if it suits, I'll be in.
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