Boring and machining...who can do it?

[DEEAR]

Hello,

I have several projects in the works, but am in need of some custom machining (which, unfortunately I cannot do just yet). The first is fairly simple, I have a DSpeck AA extender that I need bored out to CR123A internal diameter. The second is more of a multi-part project. I am in need of some press dies for use with high pressure experimental powder metal work. It would basically involve circular bars of 4130 steel, two of diameter 1.75" and two of 1" diameter. I would need concavities machined into one face of each cylinder, with the opposite end machined as flat as possible. The depressions need to be approximately 5/32" deep at the center with an even lensatic taper to the edge (kind of a bowl shaped depression). The rods would be about 1.5" long. If anyone can do this, please let me know, and an estimate would also be great. Thanks!

D-R

 

[gadget_lover]

That sounds so far out of my league that I won't even comment!

How complex is the concavity? A simple hole? A ring? A repoduction of a 1902 silver dollar?

Daniel

 

[DEEAR]

Well, the concavity would need to be a bowl-shape, so from the deepest part (the center) it would taper to the edge. If I had a lathe I could probably do it, but I don't /ubbthreads/images/graemlins/frown.gif . Anyone able to do the boring? /ubbthreads/images/graemlins/wink.gif

thanks,
D-R

 

[gadget_lover]

The boring should be pretty simple IF the DSpeck AA extender has a plain surface so it can be easily mounted in a chuck and if it has sufficient meat left after boring. Boring from AA to 123 can result in destroying existing threads, especially if the threads are internal. It's also easy to accidently cut through an O-ring groove or thread groove by mistake. The inside diameter should be a few thou over .67 inch (17 mm) to fit all possible Cr123.

Daniel

 

[DEEAR]

Daniel,

Fortunately, the threads and O-ring are external. I am wondering if anyone could knock this out, and how much they would charge? Thanks.

D-R

 

[gadget_lover]

Tell you what DEEAR, send me the diameter of the body and the diameter in the o-ring groove (or other smallest spot). If there's plenty left I can do it for you for about $20. It seems to always take at least an hour for these things by the time you set everything up. Another 30 minutes down to the post office and back.

Daniel

 

[HarryN]

Gadget - 1 hour ? Man you are getting fast on that rig. I am going to have to bring over some more toys to turn to chips. /ubbthreads/images/graemlins/smile.gif

I think you need either a lot of patience, or a cnc for the other part.

 

[gadget_lover]

Thanks Harry. What new toys do you have? /ubbthreads/images/graemlins/smile.gif

The other part can probably be cut best by CNC, but failing that a formed tool may do the trick. If I understand that correctly, it's a tool that is ground to the desired shape. Sort of like on a router bit. I could be wrong.


What's the diameter of the depression in the steel rods for this project?

 

[DEEAR]

The diamter is essentially the same as the diameter of the rods- it starts deep at the center, like a bowl, then tapers to the edge. A good analog is a rivet-set tool, just on a much larger scale.
Dimensions sent for the boring, thanks a million!

D-R

 

[DSpeck]

gadget_lover re: the AA extender - there is plenty of meat on the part to drill out the hole. Just chuck it in the lathe, and drill with an 11/16" drill. Speed and feed are up to you... /ubbthreads/images/graemlins/smile.gif You could also drill with a 5/8" drill and finish with the 11/16 drill or reamer. The CR123 cell extenders made at the same time have the exact same OD and O-ring grooves, with the ID at 11/16" instead of 19/32" (AA size).

As for the other part, I can't help with that... sorry.

 

[gadget_lover]

Thanks Doug. I appreciate the info.

I looked up the thread where you had them for sale originally. It looks like it will be pretty straight-forward. He really just needs clearance on one end so it will fit on a custom head he had made. so I only need to bore one end a bit. Sort of like you did for the KL4 heads.

Daniel