Re: PT & G Indicate/Range Rods or "Grizzly" Rods
300.00 for a 1.250 straight would provide hours of threading practice.
300.00 for a 1.250 straight would provide hours of threading practice.
Gunsmithing PT & G Indicate/Range Rods or "Grizzly" Rods
- Thread starter Cheech
- Start date
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
my machine is going to laugh at me if i try to engage the half nut at anything over 300 rpm. disengaging it <span style="font-style: italic">shouldn't</span> be a problem. if i can avoid a thread relief, i won't use one. i have used one at times though and used my internal threading tool on the back side of the part with it spinning in reverse. not on a barrel to receiver thread though.
my machine is going to laugh at me if i try to engage the half nut at anything over 300 rpm. disengaging it <span style="font-style: italic">shouldn't</span> be a problem. if i can avoid a thread relief, i won't use one. i have used one at times though and used my internal threading tool on the back side of the part with it spinning in reverse. not on a barrel to receiver thread though.
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 300sniper</div><div class="ubbcode-body">my machine is going to laugh at me if i try to engage the half nut at anything over 300 rpm. disengaging it <span style="font-style: italic">shouldn't</span> be a problem. if i can avoid a thread relief, i won't use one. i have used one at times though and used my internal threading tool on the back side of the part with it spinning in reverse. not on a barrel to receiver thread though. </div></div>
Good point. My American, DoAll, Clausing and Heyligenstaedt won't engage it over ~500.
The Farot will though, but it's a lousy machine that wont turn round parts.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 300sniper</div><div class="ubbcode-body">my machine is going to laugh at me if i try to engage the half nut at anything over 300 rpm. disengaging it <span style="font-style: italic">shouldn't</span> be a problem. if i can avoid a thread relief, i won't use one. i have used one at times though and used my internal threading tool on the back side of the part with it spinning in reverse. not on a barrel to receiver thread though. </div></div>
Good point. My American, DoAll, Clausing and Heyligenstaedt won't engage it over ~500.
The Farot will though, but it's a lousy machine that wont turn round parts.
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Worse comes to worse, flip the tool upside down and run it in reverse. That works too.</div></div>
Since this puts upward force on the tool and carriage that is designed for downward forces, could you (if you can get it there) put the tool behind the work and run the lathe the other direction?
It would be like cutting Left Hand threads but with the tool behind the tenon instead of in front.
In some ways I found Left Hand threads to be more "nerve wracking" because if you miss a number there is little time before destruction sets in.
The other thought.. If you had a tracing lathe you could set up a pattern to lift the tool before the shoulder and set the stops to stop the carriage shortly after.
Poor man's CNC.
<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Worse comes to worse, flip the tool upside down and run it in reverse. That works too.</div></div>
Since this puts upward force on the tool and carriage that is designed for downward forces, could you (if you can get it there) put the tool behind the work and run the lathe the other direction?
It would be like cutting Left Hand threads but with the tool behind the tenon instead of in front.
In some ways I found Left Hand threads to be more "nerve wracking" because if you miss a number there is little time before destruction sets in.
The other thought.. If you had a tracing lathe you could set up a pattern to lift the tool before the shoulder and set the stops to stop the carriage shortly after.
Poor man's CNC.
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
Perhaps some of the contributors to this thread could post a video clip tutorial for the rest of us??
Perhaps some of the contributors to this thread could post a video clip tutorial for the rest of us??
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
I've got a question for those that use the grizzly rod style to indicator their barrels. On the bushings, do you guys get the whole set or just the smaller bushing of the caliber you're needing?
It seems that it would really need to be an exact fit since I'm using a weight to basically force the rod to ride tight against the bottom of the rifling as the assembly is rotated? Like for a .264 bore, would the 0.2554 be enough to do all .264 bores? I mean, as long as it fits in the bore and gives somewhat of a smooth reading on the dial as it rides over the rifling does it matter if its a loose fit?
Thanks
Mike
I've got a question for those that use the grizzly rod style to indicator their barrels. On the bushings, do you guys get the whole set or just the smaller bushing of the caliber you're needing?
It seems that it would really need to be an exact fit since I'm using a weight to basically force the rod to ride tight against the bottom of the rifling as the assembly is rotated? Like for a .264 bore, would the 0.2554 be enough to do all .264 bores? I mean, as long as it fits in the bore and gives somewhat of a smooth reading on the dial as it rides over the rifling does it matter if its a loose fit?
Thanks
Mike
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
personally, i'd get each set. i want that bushing to be a close to the bore size as i can while still maintaining a clearance fit. this will do as much as you can to avoid the highs and lows as the bushing drops into and climbs out of the grooves.
personally, i'd get each set. i want that bushing to be a close to the bore size as i can while still maintaining a clearance fit. this will do as much as you can to avoid the highs and lows as the bushing drops into and climbs out of the grooves.
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
That's what I was planning on doing but just got to thinking about this discussion and thought I could save a little if I only need one bushing vs the set. Oh well, I guess you can't cheat everything.
That's what I was planning on doing but just got to thinking about this discussion and thought I could save a little if I only need one bushing vs the set. Oh well, I guess you can't cheat everything.
Re: PT & G Indicate/Range Rods or "Grizzly" Rods
Those bushings are so handy esp. because you can use them on a piloted recess cutter, crowning bit and reamer (if you use those tools).
Those bushings are so handy esp. because you can use them on a piloted recess cutter, crowning bit and reamer (if you use those tools).
