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The Offcial Machinist Thread: Revised 01/04/2014

A place to ask general spud cannon related questions.
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Unread postAuthor: Gippeto » Fri Aug 26, 2011 7:10 pm

No need to use sketch up....many things have been made using "napkin cad". Just draw it as accurately as possible and include the dimensions and allowable tolerances.
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Unread postAuthor: warhead052 » Mon Aug 29, 2011 9:08 pm

Can I get a quote for something like this to be made? The plans are about half way down.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 29, 2011 11:23 pm

It can be made more efficient ;)

And again, "something like this" is too vague a request. "Exactly this" or "according to these plans".
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Unread postAuthor: warhead052 » Tue Aug 30, 2011 9:41 am

Well, I need that made, so could I get a quote on how much I need to pay? I don't need it right away, but I will need it in the future (probably like 6 months.). Feel free to make it your own design to make it efficient, I just need it to work the same way, and have the same dimensions so I can use it in a v2 gear box.
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Unread postAuthor: POLAND_SPUD » Tue Aug 30, 2011 9:51 am

honestly do you really need it ? and are you willing ot pay around 80$ for it (IIRC that's what Kuba paid for it) ?

I don't think you don't. Mind you that you need an air tank for it. Probably a small PB tank with a reg (or probably two regs)

all in all I think the total price would be around 400$ are you really willing to spend that much on it ?

AEGs are more convinient
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 30, 2011 10:48 am

warhead052 wrote:Feel free to make it your own design to make it efficient, I just need it to work the same way, and have the same dimensions so I can use it in a v2 gear box.


Asking for a specific design to be made (providing the appropriate dimensioned drawing) is one thing, asking for the design work to be done too in the real world costs you considerably more ;)

Remember, in the past, technology was expensive and labour was cheap. It's edging towards the other end of the spectrum more and more these days.
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Unread postAuthor: warhead052 » Tue Aug 30, 2011 11:12 am

Yeah I understand. I would just like an approximate number on what I would need to save up for it. I suppose I should give an old friend a call. A cnc machine may get this done.
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Unread postAuthor: LeMaudit » Tue Aug 30, 2011 11:21 am

Him - Oh! Mighty CNC machine! Please digest my web link and provide a shiny piece!
It - Yes Master. Your wish is my command.
Him - Fell free to do it your way, just do it cheap.
It - Thank you Master.
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I HAZ A BANG!
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Unread postAuthor: mattyzip77 » Tue Aug 30, 2011 1:25 pm

LeMaudit wrote:Him - Oh! Mighty CNC machine! Please digest my web link and provide a shiny piece!
It - Yes Master. Your wish is my command.
Him - Fell free to do it your way, just do it cheap.
It - Thank you Master.

This is, indeed, priceless!!
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Unread postAuthor: velocity3x » Tue Aug 30, 2011 1:47 pm

warhead052 wrote:Yeah I understand. I would just like an approximate number on what I would need to save up for it. I suppose I should give an old friend a call. A cnc machine may get this done.


warhead,
I looked at the pics and I saw only a valve / cartridge assembly. If that's all you want then this isn't a CNC job. It can be done by anyone with a manual lathe / micro lathe. CNC can certainly do it, but I think you'll find that even if your old friend does it, it will be costly (programming and setup time). CNC is the best way to make large runs and or complicated parts, but for simple, one-off parts, many times it's not worth the effort.(Unless of course, you own the machine and you're drunk and bored on a Friday night)

A note about CNC:
CNC isn't magic. Although some parts can be programed directly from the CNC machine console, a CAD part drawing is usually the first step in the CNC process. The part file must be drawn in CAD just as you want the finished part to be manufactured. If you do not have CAD part files to give the machinist, the machinists must draw the parts in CAD. If you only have a concept or a drawing without dimensions, the machinist must also expend time to design the part(s). The cost of CAD drawing time seems to be $25-$75 per hour w/ half hr min. The cost can become very expensive due to the amount of time required just for drawing / design.

After the parts are designed / drawn in CAD, the CAD files must be processed in a CAM program. Through the CAM program, the machinist creates or programs the tool paths that the CNC machine will follow to manufacture the part. This is another process that requires time and will add to the expense.

The CNC machine must then be setup with raw material and tooling to perform the programed operations. The time required can range from very little to a lot. Again.....more expense.

The cost of raw material must be added to the cost of the finished part.

When the machining process is ready to begin and “cycle start” is pushed, the “run time” on the CNC machine will also be a final factor in the cost. Machine run time in a machine shop can range from $75 to $150 per hour. It’s not uncommon for shops to charge a 1 hour min for jobs even if the run time is only10 minutes. Again.....more expense.

A CNC, one-off simple part can get very expensive especially if the machinist is forced to be a mind reader and make a part that only exists in someones imagination. CNC is definitely not for those with a small budget.

Considering all the cost and labor involved, I have to ask.....How good of an old friend is he?
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Unread postAuthor: warhead052 » Tue Aug 30, 2011 9:22 pm

His is actually homemade, so its not one of the commercial machines. He is a pretty good friend, and he said he would be willing to do it for me if I provided the material. He also has a lathe which is one of the commercial types.

Maudit, haha, very funny.

velocity, back on what I was saying, I only need the piston assembly, the rest I can get a hold of rapidly. I already have one fellow airsofter who said that if I can get a working product, he would buy one from me so its a possible way of income for me (not permanently, but for the time being.).
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Unread postAuthor: clemsonguy1125 » Fri Sep 02, 2011 3:31 pm

Hey, Im thinking of building a hammer valve but want the "stem" machines. Heres a rough sketch with dimensions, These are not exact but give an idea of want I want its based off this design. Out of curiosity, what would be a better program to use. This sketch is just terrible. Any suggestions on the material. Im thinking around 300 psi from a shock pump. I know I missed a few measurements, and If needed for a general price quote, I can make a much better sketch.
http://www.spudfiles.com/forums/hammer- ... 17843.html
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Unread postAuthor: Fnord » Fri Sep 02, 2011 6:22 pm

Warhead,

Don't you think you could get the bulk of your project done with some washers and a drilled-out threaded rod?
Even if you try and totally screw it up, how much will it set you back, $5-10?
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Unread postAuthor: irisher » Fri Sep 02, 2011 8:54 pm

I'm in as a last ditch option. I am pretty new to this but if no one else will do it, I will give it a shot. I've got a 10x22.
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Unread postAuthor: velocity3x » Fri Sep 02, 2011 9:18 pm

clemsonguy,
You need to specify the "o-ring #" you plan on using and the location of the oring gland.
You need to specify the thickness of the flanges on each end.
You need to specify all tolerances and material.

That's a quick, easy part to make, but there's not enough info.
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