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Making a one piece bolt


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#1 Jatimatic

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Posted 12 August 2012 - 08:17 AM

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 :)

#2 Jatimatic

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Posted 20 August 2012 - 10:43 AM

Anyone, please?

#3 Cutter

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Posted 20 August 2012 - 02:35 PM

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

#4 Jatimatic

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Posted 25 August 2012 - 08:13 AM

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

#5 Cutter

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Posted 25 August 2012 - 02:34 PM

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

#6 Cutter

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Posted 07 November 2012 - 12:51 AM

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.

 

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#7 bruski

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Posted 07 November 2012 - 09:45 PM

That's amaizing. Great workmanship Cutter.
bruski

#8 Sparky_NY

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Posted 07 November 2012 - 10:45 PM

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.

#9 Cutter

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Posted 08 November 2012 - 10:13 PM

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.

 

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#10 Cutter

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Posted 08 November 2012 - 11:27 PM

Here's another look at the 3 axis cut

 

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#11 Sparky_NY

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Posted 09 November 2012 - 12:21 PM

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.

#12 Cutter

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Posted 09 November 2012 - 01:28 PM

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.

 

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#13 manatee

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Posted 09 November 2012 - 02:29 PM

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

#14 Jeff E

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Posted 09 November 2012 - 07:03 PM

Cutter,

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

Thanks,

Jeff

#15 Cutter

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Posted 10 November 2012 - 12:40 AM

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

 

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#16 Jeff E

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Posted 10 November 2012 - 09:33 AM

Thanks Cutter - The simulations helped a great deal.

Jeff




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