Antique Engines and Old Iron
[Home] - [HELP] - [Forums] - [Groups] - [Classified Ads] - [Subscribe] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Shop Equipment Tools and Techniques > Machine Shop and Tool Talk
Forgot Password? Join Us!

Notices

Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

Torque Stick for air impact


this thread has 7 replies and has been viewed 2169 times

Reply
 
Thread Tools Display Modes
  #1  
Old 12-29-2014, 08:19:28 PM
DustyBar DustyBar is offline
Subscriber
 
Join Date: Jan 2011
Location: near Kansas City, Missouri
Posts: 1,984
Thanks: 1,513
Thanked 1,606 Times in 701 Posts
Default Torque Stick for air impact

What is your opinion on using a torque stick to limit torque with an impact wrench? In our shop we have been using them a few years but I often wonder how accurate they are which is why we only use them on lug nuts. Ten pounds error or maybe twenty on a lug nut usually isn't that significant. Its hard to actually measure the torque they applied to a bolt, once the nut stops turning its not much good to test it with a torque wrench since it takes so much to break them loose and turning again.
Reply With Quote
  #2  
Old 12-29-2014, 09:08:31 PM
jcarter jcarter is offline
Registered
 
Join Date: Jan 2009
Location: Ontario Canada
Posts: 32
Thanks: 5
Thanked 8 Times in 7 Posts
Default Re: Torque Stick for air impact

A few years ago I was considering buying some of those. I talked to two tire shops in this area and they both said they would never use them. I am a big believer in properly torquing fasteners, especially those holding a rotating mass. I took their advise and didn't buy them.
Reply With Quote
The Following User Says Thank You to jcarter For This Post:
  #3  
Old 12-29-2014, 09:46:03 PM
J.B. Castagnos J.B. Castagnos is offline
Registered
 
Join Date: Nov 2004
Location: South Louisiana USA
Posts: 2,738
Thanks: 931
Thanked 3,593 Times in 1,127 Posts
Default Re: Torque Stick for air impact

It seems to me that the torque delivered would depend on the torque applied, who knows how much that is. We torque every wheel installed in our shop with a torque wrench, have two by the alignment-tire bays and one in the tool box, a chart with specs hangs on the wall.
Reply With Quote
The Following User Says Thank You to J.B. Castagnos For This Post:
  #4  
Old 12-29-2014, 09:51:44 PM
DustyBar DustyBar is offline
Subscriber
 
Join Date: Jan 2011
Location: near Kansas City, Missouri
Posts: 1,984
Thanks: 1,513
Thanked 1,606 Times in 701 Posts
Default Re: Torque Stick for air impact

They come in different sizes/colors and only limit the torque as you said. I got two for Christmas, the yellow one is marked as 60 ftlbs and the gray one is 100. I've only used the 100 ftlbs one in the shop. These are for my own use.

---------- Post added at 07:51 PM ---------- Previous post was at 07:46 PM ----------

I'm sure they are somewhat affected by the torque input. I've been told the tolerance is about 10% and if you put way too much torque into them they will shatter. We never use them as a regular extension to remove anything because of that. I think my IR is supposed to put out 800 ftlbs in reverse and something less in forward depending on which setting.
Reply With Quote
  #5  
Old 12-29-2014, 11:09:19 PM
ehpower2's Avatar
ehpower2 ehpower2 is offline
Registered
 
Join Date: Mar 2008
Location: twin cities, minnesota
Posts: 1,673
Thanks: 66
Thanked 470 Times in 352 Posts
Default Re: Torque Stick for air impact

What i always learned is they are good for wheel studs and nothing else as they are not accurate they just protect you from stripping out the wheel studs by flexing
Reply With Quote
The Following User Says Thank You to ehpower2 For This Post:
  #6  
Old 12-30-2014, 12:07:42 PM
DustyBar DustyBar is offline
Subscriber
 
Join Date: Jan 2011
Location: near Kansas City, Missouri
Posts: 1,984
Thanks: 1,513
Thanked 1,606 Times in 701 Posts
Default Re: Torque Stick for air impact

I found some instructions on the back of the bubble pack the stick came on. It says the stick is calibrated at 250 ftlbs input and 90-100 psig air. Instructions are to verify the torque with a wrench in the tightening direction and to adjust the impact if the torque is not on spec. I'm skeptical of using a torque wrench to check the break-away torque. Grey Pneumatic even says to tighten the nut with one steady push and quit when it stops turning. Of course their catalog, www.gpsocket.com, doesn't contain any of this info.
Reply With Quote
  #7  
Old 01-01-2015, 06:53:46 PM
dkamp dkamp is offline
eMail NOT Working
 
Join Date: Oct 2007
Location: LeClaire, Iowa, USA
Posts: 1,733
Thanks: 34
Thanked 935 Times in 605 Posts
Default Re: Torque Stick for air impact

The operational principle of the Torque Stick extension, is that it has known properties, therefore, will twist a certain amount based on the amount of force applied.

You can DEMONSTRATE the torque stick by connecting it to something that will not turn (like a socket in a bench vise), then attaching a pointer to the driven end, scribing a line on the workbench, then applying a needle-indicating torque wrench, and turning it until you get an indication of the torque-stick's rating, and observing the needle move off the scribed point.

Now, the torque stick twists a certain amount (known material properties, and known structural dimensions of the rod) just like a torsion bar. If the impact wrench's flying hammers can only swing it say... 10 degrees per impact, and the torque stick twists 11 degrees at that impact level, the torque stick will not be able to transmit more force than indicated.

If the torque wrench could swing it more like... 40 degrees, and the torque-stick requires three times' the rated torque to go that distance, one of two things will happen- it will either transmit more torque, or it will break.

So it depends on input, but more precisely, the NATURE of the input. If you put a standard wrench on it and then pull with your arm, it'll wind up like a rubber band, and either transmit more torque, or it will break...

And it's not a precise instrument. One could rig up a test set to measure applied torque, but the result would certainly vary based on the impact wrench's characteristics and the air pressure/volume, and probably to some level, ambient temperature.

I haven't had a torque-stick result in breaking anything, nor have I broken one, but I don't make a habit of using the impact gun to do anything other than install and remove fasteners quickly. I manually torque fasteners that are torque-sensitive. Impact wrenches are fast, and handy because they work in places when ratchets, breaker bars, and other tools would requre more hand, more body, or better angles, or a long time at all of the above.
Reply With Quote
The Following 2 Users Say Thank You to dkamp For This Post:
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
Air Impact powerking Machine Shop and Tool Talk 16 02-03-2014 04:26:11 PM
Impact of flywheel width on dyno Beth V Steam Stationary Engines, Traction Engines 1 05-12-2013 09:32:18 AM
A.D. Baker Impact Mill A.D. Baker Farm Antiques and Collectibles 4 03-15-2012 10:44:50 AM
What is your show turnout? Economic impact? mikefrommontana Steam Stationary Engines, Traction Engines 12 01-30-2011 12:57:07 AM
Good place to buy a impact screw driver Walt in Jaxn Tn. Small Air Cooled Gasoline Engines 11 04-27-2008 02:58:54 AM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 06:18:15 PM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2019 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277