Making a one piece bolt

Hello

I\'m at the moment planning on making the bolts as one piece, first turning them on the lathe and then doing the cutout portion with a CNC mill (no 4th axis) and also contouring the round shape for the guide pin that goes in to the box cam.

Just wondering about the small radius that will be at the end of the cutout section - should I make the cutout portion that much longer or modify the carrier to have the bigger holes a little bit deeper so that the radius will not contact the carrier?

Also, what would you suggest for making the firing hammer hole in the bolt flat bottomed? I do have long end mills tha I could use to flat it out on the CNC, but I\'m sure there are some easier method. Boring in the lathe is kind of awkward because of the hole size.

The firing pins will be mold ejector pins, put drilling a 1.6 mm hole about 45 mm deep doesn\'t sound great. I think it needs to be reamed so that the hole is straight and round so that the ejector pin fits, or could I just use a bigger drill, like 1.7 mm?

I know Cutter here makes these bolts and I sure like the looks, but would prefer making all the parts myself

Anyone, please?

I used a .094 end mill and made the cutout section .047 longer.
For the hole, I used a flat bottom drill.

Ah, makes sense. Did you have any input on the long and small firing pin hole or did you just make it oversize?

The firing pin hole with a 1/16 drill, on
a .210 bolt circle
The perforator pins from McMaster-Carr
#98378A405 .060 diameter.

After turning the .417 diameter and sawing the double ended pieces into they

go to the cnc mill. Mounted in a fixture on the 4th axis using 15 tools.

 

[attachment=9428:IMG_001-id=1051.JPG]

 

[attachment=9429:IMG_002-id=1050.JPG]

 

[attachment=9430:IMG_003-id=1049.JPG]

That\'s amaizing. Great workmanship Cutter.
bruski

How about a few details on your 4th axis?    It looks to be a rotary table retrofit,  what kind?   I would also be curious about how you mount it to the table, my rotary table does not have a good rigid method for vertical mounting.

Nice work on those bolts !!   I was wondering how you got into the tight corners etc.

The Haas VF2 & rotary are 2012 models.

I use a 3/32 end mill for the 3 axis cut which leaves a small radius

in the corner, but doesn\'t affect anything.

 

[attachment=9431:IMG_0081-id=1053.JPG]

 

[attachment=9432:IMG_0082-id=1052.JPG]

Here\'s another look at the 3 axis cut

 

[attachment=9433:MVI_0084-id=1055.AVI]

 

[attachment=9434:Radius-id=1054.jpg]

Thanks much for the great pictures !   For some reason I thought you had a much smaller,  hobbiest class mill !    LOL
I always envy the quality of your workmanship.

Sparky,

You are correct about my hobby mill.

I bought that in 2010 for my 70th birthday.

I wish I had a bigger one.


The VF2 belongs to a friend.

 

[attachment=9435:Syil X4 Plus-id=1056.JPG]

70 in 2010!! I was also 70 in 2010!

Cutter,

I\'m interested in how you cut the cam follower on the bolt. Can you tell us how you did it.

Thanks,

Jeff

Jeff,

Here are two simulations that I hope will answer your question.

 

[attachment=9436:MVI_0085-id=1058.AVI]

 

[attachment=9437:MVI_0086-id=1057.AVI]

Thanks Cutter - The simulations helped a great deal.

Jeff

[maccrazy2]

Jeff,

Here are two simulations that I hope will answer your question.

 
MVI_0085-id=1058.AVI

 
MVI_0086-id=1057.AVI

I know this is from 2012. Do you still have these simulations? It comes up on my media player but won\'t play. Thanks.

[Sparky_NY]

I know this is from 2012. Do you still have these simulations? It comes up on my media player but won\'t play. Thanks.

The video files are valid,  they play on my computer.      (not using media player however, I am on linux)    Still, the files are good

[maccrazy2]

Thanks. I will try them on another device.