Any of you guys capable of machining this??

admin

Out of Aluminum its .75" odThere need to be a couple alterations actually. i need to be able to attach it to a flat plate. and there doesnt need to be a recess in the end.I also need a double shear actuator for it, but if you can machine this piece that would be a piece of cake.email me. [email protected] can send this piece to you if you can machine it. I would like to get about 3-4 of these made.
Reply:socoj2, I think with those sharp dovetail profiles against a shoulder you are looking at EDM work. A lot of those guys don't like to do aluminum cause it plugs filters. If the lugs had straight sides a cnc shop could make fairly short work of it with a drawing.Machining it manually wouldn't leave you enough money to buy bullets (to shoot yourself when you see the charges).If you could stay with plastic look for somone close with a "solid modeling machine".(edit) you also may look for a shop that makes patterns and has a pantograph mill or router and then finish the inside dovetail corners by hand.Good LuckMattLast edited by Matt_Maguire; 01-02-2011 at 09:10 PM.
Reply:Originally Posted by Matt_Maguiresocoj2, I think with those sharp dovetail profiles against a shoulder you are looking at EDM work. A lot of those guys don't like to do aluminum cause it plugs filters. If the lugs had straight sides a cnc shop could make fairly short work of it with a drawing.Machining it manually wouldn't leave you enough money to buy bullets (to shoot yourself when you see the charges).If you could stay with plastic look for somone close with a "solid modeling machine".(edit) you also may look for a shop that makes patterns and has a pantograph mill or router and then finish the inside dovetail corners by hand.Good LuckMatt
Reply:An EDM shop will do brass or steel no problems, it still will prolly scare you though.Check the yellow pages or drop a line on Practical Machinist and see if you get a bite.Is the plastic not strong enough, no longer available, too hard to modify for mounting?Matt
Reply:Originally Posted by Matt_MaguireMachining it manually wouldn't leave you enough money to buy bullets (to shoot yourself when you see the charges).Good LuckMatt
Reply:What is the part for, how many do you need and how perfect does it need to be?If you only need one or two, you might consider using the original as a pattern to make a mold from, then cast it in brass. Any small imperfections could be cleaned up by hand tools, perhaps a Dremel being one. Figuring for shrinkage, maybe coat the original with wax to add the necessary few percent. For something that small, an OA torch and small stainless cylinder washed with slip might even work well as a crucible.Edit: Sorry, missed the part about needing 3 or 4. You should be able to cast that many without too much problem, assuming you could do one.
Reply:I thought of casting too Oldiron,Upon further review the dovetail features shown in the blow-up below would make this a lost wax candidate which would require a very complex mold itself... It's a dodgey little project.Matt Attached Images
Reply:Originally Posted by Matt_MaguireI thought of casting too Oldiron,Upon further review the dovetail features shown in the blow-up below would make this a lost wax candidate which would require a very complex mold itself... It's a dodgey little project.Matt
Reply:You can have the wax form for an investment casting produced by one of the rapid prototyping processes.  As small as it is I would guess under $100 each for the wax, and $200-$300 to cast 4 pieces.  How did you make your prototype?  Do you have a CAD model?JimDynasty 300DXSmith He/Ar gas mixerMM350PHobart Handler 120Smith LW7, MW5, AW1A
Reply:Originally Posted by 4sfedYou can have the wax form for an investment casting produced by one of the rapid prototyping processes.  As small as it is I would guess under $100 each for the wax, and $200-$300 to cast 4 pieces.  How did you make your prototype?  Do you have a CAD model?Jim
Reply:Ok, it's wasteful, but there is a way to do it pretty cheap.  Use the plastic piece from the toy as the "wax" piece.  It will either burn up or melt at the temperature they (the investment cast people) use to fire the silica ceramic material.  If you get it cast from steel, iron, or brass, you can braze or solder it onto a custom mounting piece.  It's wasteful, since you'll need to buy the same number of toys as the finished product, but there's no way to make a wax blank or machine that piece from scratch for less than $7 each.If you're dead set on machining it, you'll need someone with a 4-axis cnc machining center who will generate the 3D cad and program the machine for you.  I would say you're looking at $400-$600 before they even start to make chips.  If you're interested in having the cad done elsewhere and can send me the part, I can draw it up real quick for you, gratis.  Send me a PM.Fegenbush
Reply:It's a kinda small part and would be quick and easy to make out of brass or aluminum because tooling could be standard wood router bits for the dovetails. All you would need is a multi axis CNC lathe like a Mazak SQT 250 MSY (got 2 of them). Setup and programming would be the real time killer.
Reply:Originally Posted by 4sfedYou can have the wax form for an investment casting produced by one of the rapid prototyping processes.  As small as it is I would guess under $100 each for the wax, and $200-$300 to cast 4 pieces.  How did you make your prototype?  Do you have a CAD model?Jim
Reply:Originally Posted by Oldiron2In the "old days", gearing was available to couple the X or Y feed of a mill to a rotary table. I'd bet someone with a manual mill, using a slow rate on the table feed and cranking a rotary table by hand, could do a pretty good job of that using a standard dovetail cutter. Mount a chuck on the R. table, turned sideways; might have to use a 'tailstock' for the outer end of the the part, (assuming it was turned from solid and not bored yet).
Reply:i dont know of a shop in my area that would touch it if its for a firearm.tackleexperts.comwww.necessityjigs.comhttps://www.facebook.com/groups/mach...dingequipment/
Reply:Originally Posted by socoj2quite funny actually. I have been looking for a piece to convert linear motion into axial for qutie a while. and never been able to come up with something cheap.Was in Target yesterday and they had a damn nerf gun for $7. bought it and took it apart and that is the part that does it.
Reply:Originally Posted by bruceri dont know of a shop in my area that would touch it if its for a firearm.
Reply:Originally Posted by SRO1911Linear to axial is not too difficult depending on load/application. With a few more details regarding final purpose im sure there is a more cost effective solution. A simple rack & pinion set up can work wonders, as well as a captive post in eccentric orbit (think shaper drive)
Reply:So you just want a way to rotate the cylinder?  Instead of copying a webley (notorious for locking up) look at either a Mateba or to go even simpler Pancor Jackhammer (which would be about the right size for your application and a superb example of Badasss) A bit of digging on google will get you the specs on either.
Reply:Is it not something a 5 axis CNC could pull off? Looks like it.
Reply:Originally Posted by SRO1911So you just want a way to rotate the cylinder?  Instead of copying a webley (notorious for locking up) look at either a Mateba or to go even simpler Pancor Jackhammer (which would be about the right size for your application and a superb example of Badasss) A bit of digging on google will get you the specs on either.
Reply:Originally Posted by minnerIs it not something a 5 axis CNC could pull off? Looks like it.
Reply:Does it actually need to be one solid piece? Could you make the extrusions and then attach them to the cylinder perhaps through a dovetail method where they slide down the length of the cylinder and then weld the top? (Hard to describe but I suppose I could open up CAD and draw it out).I can remember in the 7th grade my mom said "people will offer you drugs" by the 10th grade I was like, "where the hell are these people?"
Reply:Originally Posted by joefitzDoes it actually need to be one solid piece? Could you make the extrusions and then attach them to the cylinder perhaps through a dovetail method where they slide down the length of the cylinder and then weld the top? (Hard to describe but I suppose I could open up CAD and draw it out).
Reply:You should look at a yankee screwdriver.  One helix machined into a cylinder is all you need if the rotation will be in one direction only.  You could actually wind a flat bar onto a cylinder to get the same effect too.Or steal the mechanism from a benchmount corkscrew.What about making a silicon rubber mold of your part.  Slit the mold and peel it off the part.  Then use the rubber mold to pour wax.  The rubber may be flexible enough to peel off the undercut places and not tear up the wax.  Then do a ceramic mold on the wax, etc, etcDynasty200DX w/coolmate1MM210MM VintageESAB miniarc161ltsLincoln AC225Victor O/A, Smith AW1ACutmaster 81IR 2475N7.5FPRage3Jancy USA1019" SBAEAD-200LE