Need Rod bent and formed

wdugdale

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I want to upgrade an old reloading press and I need 3 parts.... I just don't have the equipment to fabricate these.

Two of them are made from 5/8" STL Rod.... they form a knuckle
Third part is a metal sheet with 2 bends with specific drill holes.

The 3 parts are detailed in the PDF with specifications with the last page showing how they fit together.

Any help fabricating these or pointing me to a source would be appreciated.
 

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  • PartsNeeded.pdf
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How much pressure will be put on this ? Wouldn't straight line and roller work instead oh the bends.? Bending rods like that is encouraging breakage. They would more likely be forged . You could get them welded up , still chances of breaking. The only way I see them made is milling from solid , no bending. Even then the 90 degree may need bracing .
Just trying to help not anything else.
 
How much pressure will be put on this ? Wouldn't straight line and roller work instead oh the bends.? Bending rods like that is encouraging breakage. They would more likely be forged . You could get them welded up , still chances of breaking. The only way I see them made is milling from solid , no bending. Even then the 90 degree may need bracing .
Just trying to help not anything else.

Pressure on the straight rod is usually 35 psi with a max of 100 psi. Based on other data, pressure on specific bends/joint could be more than 10,000 psi based on the Von Mises Stress on Knuckle.

Sounds like welding instead of bending would be easier to fabricate.
 
I'm all for machining from solid. You could use flat bar for the 90° bar, and there is a way to machine a "bent" part as you have drawn the 27° off axis part. It's small, compared to what I am used to seeing. In the oilfield, directional drilling in particular, the use of "bent" subs is very common. Some are even built of multiple components in order to be adjustable. Some though are fixed angle. They come in sizes up to around a foot in diameter and 6 feet long, however. But the machining processes would be pretty much the same.

On your 90° part, you have drawn it with no inside radius, which would weaken it and make it impractical to machine, in any case.
 
I am curious as to why you designed part#1 as you did. It appears to be a linkage transforming vertical movement of part #5 to horizontal movement of part#3. A straight bar will accomplish the same. Also, why the dog leg in part # 5? One of the great features of SolidWorks is the ability to play around with your designs to make them more construction friendly.
 
I am curious as to why you designed part#1 as you did. It appears to be a linkage transforming vertical movement of part #5 to horizontal movement of part#3. A straight bar will accomplish the same. Also, why the dog leg in part # 5? One of the great features of SolidWorks is the ability to play around with your designs to make them more construction friendly.
That's why i suggested straight line and roller to reduce friction and less chance of bending and breakage. He's trying to reload brass shells rifle or pistol. At least by the pictures.
 
I was looking at the mechanism wrongly. Parts 2 & 3 are a pneumatic cylinder and it appears that the intent is to operate the press pneumatically. The 1-1/4" bore will develop less than 200 lbs. of force which, in my experience would not be sufficient to operate a reloading press if used for swaging brass. Also, converting the direction of motion from horizontal to vertical will be inefficient. Much better to mount the cylinder vertically, either above or below the press.

If that is not feasible, I would consider using a a double armed crank with a pivot below and to the back of two lines of motion. Linkages would be required on each arm as the motion is through an arc rather than linear.
Crank.JPG
 
Mount the cylinder so that it can follow the arc of motion. No need to keep it rigid. Mount on a pivot.
 
Thanks for the reply all. This will allow the reloading press to be pneumatically controlled as RJ mentioned. Parts #1 and #5 are the main two parts I am trying to bend.

In the completed diagram, Part #2 is Pneumatic cylinder, Part #3 is a threaded linage that attaches to part #2. These two off the shelf parts allow to attach the Pneumatic to the dog leg part #1. This allows there to be motion on both ends of part #1.

Part #5 is the other custom part that will attach to the reloading press's arm to allow for pneumatic control.

RJ: I'll be doing a FL Resize on 9mm and 223 brass..... do you think the force would be sufficient to complete?


I'm all for less chance of breakage and issues.

What I can investigate is using a straight line and roller that Tony & Silver bullet suggests.:
Using a 3/8 or 3/8 X 5/8 flat stock as the straight part.

SilverBullet: How would you connect the flat bar to the reloading press (part #5)

Thanks
 
One last question: I can also look into positioning the Cylinder under the press in a vertical.

Tony: where on the Cylinder were you suggesting to pivot?
 
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