Cutting a 1 1/4 inch radius for Home build.
Just started my second Homebuild gun. Part of making the top rail and the trigger housing is mating these parts to the 1.25 inch tube. On the first gun, I cut the 1.25 inch radius the hard way — standing the part upright in the vise and comming down from the top using a boring head.
Today, I built a 1.25 radius milling cutter. Started with a 7/8 inch piece of drill rod. Cut a 1.25 radius in the end using a grinding wheel radius cutter that was adapted with a cutting tool. The piece I am cutting is chucked up in the mill.
Then you cut away half of the round:
Now heat it up with a torch and quench it in a bowl of water. Check out the “RED HOT” color! Comes out rockwell 65 — very hard!!
Now to try it out on a scrap piece of aluminum.
Here is the trigger housing, cut with a 1.25 radius to match the 1.25 inch tube.
Mark
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That didn’t even came to my mind… oh well it explains why my machining skills sucks in the first place π It’s even better idea.
Just to make sure I got it right. You meant like this?
It’s not entirely connected since the circle will turn to ellipse when tilted but I bet it’s close enaugh.
Baz,
That’s how I used to cut my radius. A other thing you guys might want to try is using a smaller mill at an angle.
Say for instance if I want to cut a 35mm radius in a 20mm wide part I’l use a 24mm mill at an angle of 37 degrees will make a radius 0.02mm smaller than that 35mm.
Just a thought.
Regards,
Marc
Yep. (DLC or Diamond Light Carbon) is similar to Tin and to many other nitride or carbide coatings. The surface hardness is 2-4 times more and friction only half. It is especially good for tools used to cut aluminium where the cold-welding is problem.
Thanks. I appreciete.
Great info!
I was unsure how I’d deal with cutting the radius on my build, now I have multiple plans of attack!
Thanks
MB
WoW!!!!
Think of what you could do if you had a mill also!!!
Mark
I am loving it. Lots of good ideas. Thanks guys!
Not got a milling machine but I try my best have a look at this it was all cut out on the lathe
mcMike:
Diamond plating? I am not sure I know that process? Is that like Tin (titanium nitride) plating ?
Your ground breaking work on the in tank regulator is incredable!!!! — it will be a long time before anyone tops that!
Mark
Baz:
Thats different / clever !! Thats backwards! the cutting tool is in the chuck and the work piece is in the tool post.
Nice looking finished piece. Did you grit blast to get the nice finish?
Mark
This is how the radius was cut in my home made breach block on a project I’m doing. A piece of HSS was held in a bar with grub screws
and the bar held in the lathe with the aluminium bar held in the tool post
I always wondered how you guys do that. Very clever.
And on right path… true gunsmith / blacksmith builts their own tools.
Why don’t you send it for diamond-plating? I just sent similar tool to such service (in my dayjob) and the price was only 20Γ’βΒ¬ which was ridigilous low. The surface is VERY hard and slippery. Think I will send my next valve there too.
I mean… how many of us has diamond coated firing valve π π
good work mark once again mate π
Great post, thanks.
Roy S.
Thank you so much. That is something that has alluded me. I can use that technique for sure.
Great addition!
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That’s exactly what I mean Mike. I always make shure the edges touch the tube that way you barely notice it’s an elips.
Putting the head at 54 degrees will get you within 0,02mm
Here’s what I mean.
Regards,
Marc