Home |
Search |
Today's Posts |
|
Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
|
LinkBack | Thread Tools | Display Modes |
#20
Posted to rec.crafts.metalworking
|
|||
|
|||
Machining Question
On Apr 8, 2:48*pm, Cydrome Leader wrote:
Steve W. wrote: Cydrome Leader wrote: RogerN wrote: I'm close to milling my AR lower receiver, this "95%" machined receiver needs a pocket for the fire control group and 3 holes cross drilled for 2 pins and a selector/safety. I found some instructions for machining the pocket using a DRO, they recommend drilling the selector switch hole, machining the pocket *then drilling the trigger & hammer pin holes. *Why not drill all 3 cross holes in that 1 setup and then machining the pocket? *I would think the drill bits might be more likely to walk as they start through the 2nd side. *I don't see a benefit to set up for drilling, turn turn the part for milling, then turn back to the first setup to drill 2 more holes, any idea why they would do, or recommend this? https://colfaxtactical.com/docs/Fire...%20with%20a%20.... RogerN does anybody make plastic unfinished lowers, just for machining practice? It would seem like a shame, and expensive to be using trashed lowers for the next aluminum casting project. As long as you follow the directions and have some ability they are not real hard to machine. The biggest thing involved is to KNOW the machine you will be using. If you know that your machine has .020 backlash on the X axis repeatably then you can correct for it. If you think it does but in reality it isn't repeatable then OOPS you get a scrap upper. It's a chicken and egg sort of deal to anybody (like me) that's new to machining, but familiar with what the finished product should be. Do I right now have the ability to finish *a lower receiver? No, I do not. Could I learn? sure, but it will take lots of practice, which at this point would be futile and expensive if I bought a box of forgings and jumped right in. I'm sure I'd learn quite a bit trying though, while making a huge pile of scraps, but again, it costs to much to try. You are not as far off as you think if you invest the time and you continue to think and ask questions about why you are having problems You have tremendous resources in this group: Lloyd Sponenburgh, Precision Machinist, Bottlebob, and lots of others. Use them. The more parts you make out of different materials, the better you will get. |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Machining HDPE question | Metalworking | |||
Group question on machining something | Metalworking | |||
Alloy machining question | Metalworking | |||
Machining question | Woodworking | |||
Machining question | Metalworking |