Dusty Stevens
Shiner
Yes thats what ive seen
How NOT to validate your chambering job
- Thread starter INTJ
- Start date
Dusty Stevens
Shiner
When i have to use one i have a piece of unistrut on my shelf above that swings out and i hook a string and weak spring to that to hold the grizzly rod up. I heard about the weight thing and used that until i realized it was reading the bottom while i indicated the top. I used a 2oz bell sinker and fishing line tied in a loop i slid on there.
Hell, I go the wrong way with my adjustments half the time anyway. Maybe that would help!!
Not how I use it.
I sling a weight on the rod so that the bushing rides on the bottom of the lands, takes out the slop.
I doesn't really matter how the Grizzly Rod is loaded. There is still tolerance between the rod and bushing and between the busing and bore. Not to mention the rod's natural resistance to being deflected.
With a high quality direct reading indicator there are no such tolerance issues. Maybe a little flexing when an ultra long stylus is used, but that is easily seen and mitigated.
That doesn't mean the Grizzly Rod wont work well enough, especially with a floating reamer holder, but any attempt to say it's on par with a good direct reading indicator is simply a rationalization. I know because that is what I used to tell myself until I figured out how to use the Interapid.
With a high quality direct reading indicator there are no such tolerance issues. Maybe a little flexing when an ultra long stylus is used, but that is easily seen and mitigated.
That doesn't mean the Grizzly Rod wont work well enough, especially with a floating reamer holder, but any attempt to say it's on par with a good direct reading indicator is simply a rationalization. I know because that is what I used to tell myself until I figured out how to use the Interapid.
Dusty Stevens
Shiner
Youll love it if you ever get it. I use mines every day
Dusty Stevens
Shiner
Are you getting the indicator with the tip or getting “just the tip”?
LVLAaron
Gold $$ Contributor
I had ordered the indicator and the 5.5 inch "tip" from them... but if they're not gonna fulfill orders I can get the indicator a dozen other places... but its worthless to me without the tip... which I can't find anywhere else.
I disagree in the context of using a 5.5" stem. As I stated previously- I know we're not "measuring"- but the half thou becomes a full thou. I'm not convinced a couple of tenths would even be discernible on the dial- or the movement itself being sensitive enough- to move the needle with a tenth of movement.
There's no clearance between bushing and rod, and bushing and bore when it's weighted, and the parts are "pressed" lightly together- the clearances are removed.
Explain to me how "a little flexing"- manifests at the dial? It doesn't...
No reason to speculate which one of us is correct- I'll call Long Island Indicator next week and ask 'em.
I guess I disagree with you a lot.
Two tenths absolutely are discernible with a 5.5" stylus, as those of us who use them know.
It is incorrect that there is no clearance with a weighted Grizzly rod. If there was no clearance the bushing couldn't turn when the chuck is rotated
The long tip potentially flexing or hanging up is hard to describe if you haven't used one.
I am not speculating about anything. I am describing what I have actually seen. You do what you want and be happy........
xr650rRider
Silver $$ Contributor
I got the tip from Long Island Indicator in about a week. I've never seen it anywhere else. I think some people made one.
5.5" Indicator tip
xr650rRider
Silver $$ Contributor
I guess I disagree with you a lot.
Two tenths absolutely are discernible with a 5.5" stylus, as those of us who use them know.
It is incorrect that there is no clearance with a weighted Grizzly rod. If there was no clearance the bushing couldn't turn when the chuck is rotated
The long tip potentially flexing or hanging up is hard to describe if you haven't used one.
I am not speculating about anything. I am describing what I have actually seen. You do what you want and be happy........
There was a discussion several years ago on Practical Machinist about the grizzly rods and not even using the tip of the indicator but further up the stem to try and alleviate some of the inaccuracy.
https://www.practicalmachinist.com/forum/threads/grizzly-vs-clibre-specific-indicator-rods.248343/
Two parts making contact = no clearance. Following your logic, there would then also be clearance between the stylus and the barrel. There is no difference between the two.
DaveTooley
Gold $$ Contributor
Food for thought. Might keep some awake at night. 
I'm chambering some barrels today. I use the Interapid 312B-15. With accuracy of the digital read out on the Haas I decided to see if I could come anywhere close to the same accuracy with the indicator. Without moving the barrel and comparing the indicator VS the readout of the Haas the best I could repeat moving the cross slide was +/- .0001". Now double the stem length and you've double that error.
I'm chambering some barrels today. I use the Interapid 312B-15. With accuracy of the digital read out on the Haas I decided to see if I could come anywhere close to the same accuracy with the indicator. Without moving the barrel and comparing the indicator VS the readout of the Haas the best I could repeat moving the cross slide was +/- .0001". Now double the stem length and you've double that error.
Food for thought. Might keep some awake at night.
I'm chambering some barrels today. I use the Interapid 312B-15. With accuracy of the digital read out on the Haas I decided to see if I could come anywhere close to the same accuracy with the indicator. Without moving the barrel and comparing the indicator VS the readout of the Haas the best I could repeat moving the cross slide was +/- .0001". Now double the stem length and you've double that error.
Yep. That is what I expect and I am happy with .0002" when I have to use the 5.5" stem.
The Grizzly rod undoubtably has more error, even with it weighted. It likely takes what, .0002" clearance for the bushing to turn around the rod? .003"? Not to mention the rod flexing.
More importantly, every time I checked my Grizzly Rod dial in with the Interapid, I found the Grizzly Rod wasn't showing all the movement.
But guys need to do it the way they want. We get away with a lot in this game..........
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LVLAaron
Gold $$ Contributor
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