How to hold a TC Contender barrel for threading.

[Ksracer]

Those are at least 2.5" bore? What you going to do with the lug on chamber end of barrel?

The black one is probably short enough it would hang out the back and sit inside the chuck bore.

 

[urbanrifleman]

For that little stub of a barrel I think I would have just shimmed it and stuck it in one of these two jigs.



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You have more tooling than 5 other gunsmiths put together.

 

[urbanrifleman]

It's a spider and a bearing. You can make one!

I could 3d model one that's for sure. I'm a designer not a fabricator.

 

[LVLAaron]

You have more tooling than 5 other gunsmiths put together.

All of the widgets come in handy. And they're fun to make.

 

[xr650rRider]

The black one is probably short enough it would hang out the back and sit inside the chuck bore.

My 8" 4 jaw chuck only has a 2" bore. Maybe a 10" or 12"

 

[LVLAaron]

Judging from the first picture, it'll fit.

 

[xr650rRider]

I would gladly pay for a bearing steady if someone would make me one.

I've never found a flange mount or pillow block bearing that has the runout I want. Find one with precision .0001" bearings.

 

[Ksracer]

I would gladly pay for a bearing steady if someone would make me one.

I'm seriously considering it after looking at these pics.

Question... I believe most of those pillow block styles use a CN or C3 bearing and have several thou of radial clearance. Does that pose an issue while using them?

 

[Ksracer]

I've never found a flange mount or pillow block bearing that has the runout I want. Find one with precision .0001" bearings.

Runout won't matter because it will be compensated for with the screws.

 

[xr650rRider]

Runout won't matter because it will be compensated for with the screws.

until it rotates.

But it might be hand grenade close.

 

[urbanrifleman]

until it rotates.

But it might be hand grenade close.

Until what rotates?

 

[xr650rRider]

Until what rotates?

The bearing.

 

[Ksracer]

until it rotates.

But it might be hand grenade close.

The inner race could have .010" runout while being spun and it won't matter as long as that .010" is in the same spot everytime. If one of the balls or rollers is larger than the other, you'll have non-repeating runout that will show up only once in several revolutions. BUT most rollers are held to microns of tolerance and it's more than likely a non-issue.

The clearance between the rollers and races could cause a few problems, but there's ways to tighten that up.

 

[xr650rRider]

Then why don't we use cheap bearings in the spindle?

 

[urbanrifleman]

The inner race could have .010" runout while being spun and it won't matter as long as that .010" is in the same spot everytime. If one of the balls or rollers is larger than the other, you'll have non-repeating runout that will show up only once in several revolutions. BUT most rollers are held to microns of tolerance and it's more than likely a non-issue.

The clearance between the rollers and races could cause a few problems, but there's ways to tighten that up.

So which bearing should one use then? As to not be "cheap".

 

[Ksracer]

So which bearing should one use then? As to not be "cheap".

A C1 or C2 bearing will have less internal clearance than a "normal" one. Bearings are usually either pressed into a bore or over a shaft. Sometimes both. This removes internal clearance so they have extra to start with.

But I don't know if you're going to find a C1 pillow or flange mount bearing. You could also build your set screw sleeve with a heavy press to remove some of it.

Maybe the guys who have built them can chime in on if it's even an issue to begin with.

 

[xr650rRider]

Buddy bought a PM-1340GT from a guy that had built a custom steady rest that could support a 8" OD shaft. He built it out of 1" precision ground 4140. Rode the ways perfectly, lock down better than factory. So I'd want that concept with precision spindle bearings. Basically a duplicate of spindle in headstock, just facing other way with spider.

 

[LVLAaron]

Buddy bought a PM-1340GT from a guy that had built a custom steady rest that could support a 8" OD shaft. He built it out of 1" precision ground 4140. Rode the ways perfectly, lock down better than factory. So I'd want that concept with precision spindle bearings. Basically a duplicate of spindle in headstock, just facing other way with spider.

I'd like a bigger one for my 14-40 as well.... The factory steady is laughably small.

 

[xr650rRider]

I'm sure the question of why would anybody want to mess with these Encore/Contenders, shorten, thread. And those are threaded. Makes a pretty handy suppressed rifle out of a box blind. Any better youth rifle?

 

[Ksracer]

I'm sure the question of why would anybody want to mess with these Encore/Contenders, shorten, thread. And those are threaded. Makes a pretty handy suppressed rifle out of a box blind. Any better youth rifle?

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I'm guessing this one is going on some suppressed hog hunts.