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Posted: 2/1/2011 4:07:41 PM EDT
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I've been looking through AeroE's post from a while back about Leeroy in Australia building his own action, and can't figure out how one would do this without CNC. I know it could be done with a jig, but I was wondering if I'm missing something that wouldn't require anything special.
How do you take a peice that looks like this And mill it to look like this ? I'm thinking it needs to be rotated as it's being milled. Like I said, my best guess so far is a jig that holds the peice in place and allows for controlled rotation while being milled. Any insight would be appreciated. ETA: Also, grooves like this... |
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Yep. I really need to get one for some of my projects. 
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Lathe for the threading and turning part,
Mill with a rotary table/chuck attached/tail end on the mill to do the final milling passes as seen in the below photo (note that the machine is not a lathe, and the rotary table with chuck and end tail with a dead center is bolted to the mill table (mounting slots in the mill table clearly shown). By hand manually, a few hours to complete. With both the lathe and mill set up CNC with G code prewritten, about 5 min with set up included is all 
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Quoted:
Lathe for the threading and turning part, Mill with a rotary table/chuck attached/tail end on the mill to do the final milling passes as seen in the below photo (note that the machine is not a lathe, and the rotary table with chuck and end tail with a dead center is bolted to the mill table (mounting slots in the mill table clearly shown). By hand manually, a few hours to complete. With both the lathe and mill set up CNC with G code prewritten, about 5 min with set up included is all http://i376.photobucket.com/albums/oo201/Leetren/IMG_0157.jpg And that does look to be an enclosed machining center (CNC with 4th axis) ––makes it pretty. |
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Quoted: Walk in the park, Do all the normal lathing.milling first, the go back in with a Wire EDM to cut the bolt lug/locking channels last. Also to note, you can get blank receivers already EDM cut as well if you don't have a EDM wire machine. Hell, I haven't even replaced the lathe and mill I had to sell a couple of years ago yet. Lathe will be here Thursday, mill in a couple of months, wire EDM... yeah, not even in the plans yet ;) Where might one find a blank receiver? I want to build something stupid this spring. |
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There is a guy on Homegunsmith.com that is selling EDM channel cut bar stock for the 700 receivers (bolt lug channels and through lock up passage only, so you still have to do all the boring/milling/threading to complete it .
http://www.practicalmachinist.com/vb/gunsmithing/making-remington-700-action-179971/index2.html But keep in mind that you can buy a complete Rem 700 action from Brownells with trigger/safety/bolt for around $400 to $450 (dealer discount), so unless your going to hold match dimensions and produce a true 700 match action like that of the top action makers, might be cheaper in the long run to just buy a 700 action, and go from there with blue printing it, and even making or buying a match bolt and trigger assembly to finish the match build. The old bolt and even the old trigger you could sell off to recover some of the money. Bottom line, everything on the receiver is a semi easy to do on a lathe/mill, it's the cam surface for the bolt lock up, and getting the race ways cut that is the semi hard part of the math. But, as shown in the above post, making a broach cutter and setting up a cam cutter is no so hard, and does make building such on the snap side once they are completed. |
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