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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Gotta love those Nazi rocket scientist. To bad the metric system didn’t help them win the war…lol
I hate to tell you this but it was actually METRIC SYSTEM and German engineers (Werner von Braun) after WW2 which got you to the space and therefore to the moon. Their plan just failed. They wanted to get you ALL there π π
NASA has been using metric system since -91 but because rest of you can’t join the group you even crashed space probe in -99 because JPL (Jet Propulsion Lab) wanted to stick in imperial units and couldn’t convert them to metric properly.
And the connection between ALL units. You can derive any unit from other unit and check your calculations by simply calculating with units only and see what is left. You can move from Pressure to Force and so on. Just think how much simpler designing anything related to airguns is with metric system.
Well, I wouldn’t say that foot or inch is defination of nature either. I mean who’s feet are we talking about…. oh wait the KING’s foot of course π π
Just wonder what body part they used for inch π
It may have got us to the moon but the first few sounding rockets slammed into the surface at over 14,000mph…
Lets just say Newton was wrong… π―
Here is what I dig on in the metric system, the connection between linear measurements and volume measurements…
One cubic centimeter equals one milliliter.
Which would be the equivalent of having the US system so integrated that one square foot of water equals one gallon…
Although I like the metric system, the definition of a meter is not exactly related to nature as much as it is the scientific distillation of nature into a Gregorian system of human based constants.
Mike and Marc you both are right. It would be easier, but then again speaking English is not the easier language and just look at us….Chatting away in English….LOL
We will just have to bumble our way using English units…..It got us to the moon. So I guess it works….LOL
I simply can’t understand you britt’s and yanks use imperial. Join the club and start using metric. π
Indeed π
I would suggest all imperial unit users to take even a sneak peek look of this page: http://www.metric4us.com/why.html
Just spend 1 minute on that page and you realise why it is so much easier to use metric system π
He would have to use metric dimensions since imperial units are not real numbers – oh wait. Walter is from Canada. They DO have real numbers there π (one of the two reasons I love canada; standard units and ice-hockey).
I will design my next regulator so that it only works with kPa and not with Psi. Hah! ;P
When I was growing up they tried to convert us to the Metric System. Then they wised up and remembered….”We are the USA” screw everyone else. So far that is our policy on just about everything π
He would have to use metric dimensions since imperial units are not real numbers – oh wait. Walter is from Canada. They DO have real numbers there π (one of the two reasons I love canada; standard units and ice-hockey).
I will design my next regulator so that it only works with kPa and not with Psi. Hah! ;P
and the friendly intelligent citizens eh? π
We are a ‘metric’ nation but fight it every chance we get for sure.
BTW still itching for a regulator diagram……
Walter…
He would have to use metric dimensions since imperial units are not real numbers – oh wait. Walter is from Canada. They DO have real numbers there π (one of the two reasons I love canada; standard units and ice-hockey).
I will design my next regulator so that it only works with kPa and not with Psi. Hah! ;P
Say a 1″ endmill tipped to 23.6 degrees would get you a nice fit provided it is not too deep. Make cuts until happy with fit. I test in a piece of scrap hardwood.
Walter….
Thanks. My little head understood that better…lol
For a 1.25″ radius (2.5″ diameter)
Say a 1″ endmill tipped to 23.6 degrees would get you a nice fit provided it is not too deep. Make cuts until happy with fit. I test in a piece of scrap hardwood.
Walter….
SIN(Angle) = CutterDiameter/DesiredDiameter
Works well esp if shallow cuts as in receiver fits to tube.
Walter….
Walter give us an example with real numbers. Let say I want to cut a 1.25″ radius.
Thanks. I had the angle measured from wrong direction.
That is even better than contact with whole surface. The edges will make the seam seems seamless (lol. Is that even english).
For these cuts I use this:
SIN(Angle) = CutterDiameter/DesiredDiameter
Works well esp if shallow cuts as in receiver fits to tube.
Walter….
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Used both metric and imperial , and metric is just so dam easier ……the only draw back is it was started by the French……….uhhhh!!!!!! π―