Messages

5311

Show"N"Tell ( What you have made with your CNC machine.) / Re: MODEL 629 S&W MAGNUM

« on: December 13, 2009, 01:54:24 AM »

The trigger will need to accurately held in place when machined. The first thing required is making a jig and drilling some small holes. I made a sensitive drill press, but, it would be so much better to avoid multiple setups. Picture 5 shows my home built engraving / milling machine which is extremely accurate. since a lot the tolerances will be to a thou. It helps to have an extended eye relief microscope for this kind of work. The one shown is 30x and 9" eye relief. You need that for drilling small accurate holes.

To drill the holes i will be using an MPG to bring the Z axis down for drilling. The MPG  is adjusted for very fine touch / feel as you rotate it instead of calibrated positioning. So the first thing was to experiment and see how it all would work. Picture 6 shows drilling 0.020" holes into C/S. I could see the drill walking....it dosen't take much. Note that the difference in the sharpening of the drills between 6A & 6C. Never buy junk small drills in these sizes as your
wasting your money. Actually a home sharpened jewelers bit is much better.  The trick in drilling small holes is to spot mark the surface and then just let the drill do it's job of penetrating the surface a few thou. Under the scope you can see any bending or run out of the drill bit. Pic 6B shows the bit just .005" deep and breaking the surface.

BTW, it helps to have a nice smooth surface. The drilling was done at 30,000 RPM  and to a 3/8" depth. Picture 6D shows the fit of the 0.0205" diameter pin, it's perpendicular to the surface and a hair is shown for comaprison.The center to center distance of the holes measured to with in a thou of required spacing.

A jig will be made which duplicates the frame mounted such that the trigger can be mounted and the shear surfaces hand done. ( that's how i used to do Ruger Blackhawk trigger jobs).

The pictures are what i see when using the the microscope.

Stay tuned for the fun,
RICH

5312

Show"N"Tell ( What you have made with your CNC machine.) / MODEL 629 S&W MAGNUM

« on: December 13, 2009, 01:51:04 AM »

This project is going to take some time so you will be reading this thread over a year or two.
There are a lot of small challenges to make this working model to a scale of 1/3 size.
The pistol will be functional but not shootable. Estimate that it will take some 200 hours plus to do depending on how many cutters and jigs need to made. So yep, it will  a labor of love, patience, and just fun in the challenge.  I always wanted to do something like this every since my friend made a miniture flint lock rifle which shot BB's for his 5 year old.

The cnc equipment will be used a lot along with CAD, CopyCat, photOgrAphy, image manipulation and tricks yet to be created. The scope may never get done as the optics for it may not be possible.

Picture 1 gives a comparison of the size.  Picture 2 shows some real rough overall dimensions.
Picture 3 shows the internals of the revolver. The hammer shown in pic 3 will fit on the end of
a piece of rod a little bigger than 1/4" in diameter. Picture 4 shows a cad file for contouring of
the trigger along with the Gcode generated out of LazyCam and into MACH3 Mill. Figured i would start with something easy. The brutal part of this is that a jig will be made such that
the shear surface of the trigger can be done.

I will posting a lot of pictures, so follow along if you wish and coment as you like.

RICH

5313

Show"N"Tell ( What you have made with your CNC machine.) / Re: M1 MILLING MODEL

« on: December 12, 2009, 10:05:05 PM »

Hmm....
Bet that would be mean with rock salt in it! 
RICH

5314

General Mach Discussion / Re: engraving bit?

« on: December 12, 2009, 09:55:43 PM »

I like to use dental dental burrs. For larger engraving small end mills. Once in a while a v shaped bit. For real fine work, say 0.005" wide text or a scibe line in soft material i just use a ground carbide or hardened steel point.  Just be carefull on the small stuff as you can't have backlash as it will break tips in a heart beat. You can buy tips also.
RICH

5315

General Mach Discussion / Re: Spindle speed calibration?

« on: December 12, 2009, 06:10:01 PM »

Timing ( single index only ) for the lathe is no longer functional and you need to uncheck "Disable Spindle Relays" also. I have never used any of the speed controllers so someone else will need to chime in.


RICH

5316

Show"N"Tell ( Your Machines) / Re: My CNC pressbrake build

« on: December 12, 2009, 03:34:24 PM »

Will enjoy following along as you build it so keep posting pictures.
RICH

5317

General Mach Discussion / Re: Spindle speed calibration?

« on: December 12, 2009, 03:26:35 PM »

Fastest1,
What version of Mach are you using?
Is this for a mill or lathe?

RICH

5318

Show"N"Tell ( What you have made with your CNC machine.) / Re: An unusual application for Mach ?.

« on: December 12, 2009, 10:10:46 AM »

Tweakie,
If i send you a card, can you put your info into so i buy all the things i ever wanted? 

How does that creative mind come up with this stuff? 

RICH

5319

Show"N"Tell ( What you have made with your CNC machine.) / Re: M1 MILLING MODEL

« on: December 12, 2009, 09:40:02 AM »

Ed,
Would like to make it bigger, but, but sound effects from  "Dirty Hary" will have to do.

Sam,
Unfortunately it will never be fired, functional in all other respects.

RC,
Yep, that's what you call a grill. I wonder what the neighbors would think if we made one and stuck it on the deck.
The wife would probably ask me to get a check up. Last time i went to have the back end checked ( if you know what i mean), I brought a paper in for the Doc to sign. It would certify that he did an inspection and confirmed that he did not find my brains up my ask. Figured the wife wouldn't be able to dispute what she sometimes believes. He refused sign it, i told him that with a name like Dr. Butt ( and that is his true name), he should be happy that he is truely helping a fellow man in his endeavor to find truth. He didn't agree with my philosophy and still refused to sign the paper. Went home and told the better half that i wanted a new back end Doc since i said he hurt me. She asked what he did. I told her about him refusing to sign the cerificate. She then informed me that maybe he already knew what she has know for years. Sometimes you just can't win! 

Quess it time for a new thread! 

RICH   

5320

Show"N"Tell ( What you have made with your CNC machine.) / Re: M1 MILLING MODEL

« on: December 11, 2009, 11:06:52 AM »

No the cases were purchased. I happen to come across a sale on them and bought six cases.
Don't know if I'll ever fill them all.

Sizing up the next project. This one is going to take some time over time ( won't be done in the next year ). I will quess that it will take 200 hours for the proto type. The scale dosen't seem too bad.

Lettering will be around .020" high. This is were CNC is realy going to come into play even though there will be a lot of hand work required. Will be using the engraving machine to do a lot of the work as it is a very accurate
machine and i can hold close tolerances. Hopefull won't have to make too many special milling cutters.

First thing will be to totaly measure and draw the revolver to scale. CopyCat will be used to get all the contours.  We'll see..........making little bullets sounds like fun. Probably end up with two of them as
the proto will be made out of Al. The grooves for the scope mount will be done. Now a function scope in that size ........good grief i hate optics!

Here is a few pics,
RICH