I was one of the early buyers of one of these when they first came out, and it has been flawless, undoes things my big gun wont because of the higher impacts per minute seem to be more effective for some things.
Where I work we would shear off the splines like that on our 1" IR guns by running them at very high pressure (300+psi). I found that IR already had a solution they employed on their higher end models and that was to drill holes down the length of the rotors so it looks like the cylinder of a revolver. That reduces the inertia the rotor carries and keeps it from breaking itself like that. And cool video btw.
I used a CP model 734 for appox 30 years and in that time i had to install 3 tune up kits. No parts failure except the air vanes wearing out and a couple of leaking gaskets.
@@ToolTeardowns it's not likely you're still reading comments from a 2 year old video, but: have you in fact tested the shaft of that rotor for hardness?
As someone already mentioned : too much pressure applied most likely. Another option - too long hammering process may also cause similar issues, but less likely
It wonder if they use the same guts for the CP7732 1/2" drive as they do for the CP7731 3/8" drive, rated at 415 ft-lbs. Very coincidental that two of your samples sheared at the spline the same way- were they purchased from the same batch in production? Have you ever done a tear down on a butterfly impact wrench? I've been trying to determine the failure on a HF sample that doesn't spin up but just vents air, but after taking off the end cap, the air motor doesn't simply drop out as easily as shown here, and there's no visible snap rings or anything holding it in. Maybe need to take a hydraulic press to it and press on the drive tip, but wanted to see if there's something I'm missing first.
Okay so the problem there is the two bearings are poor quality and they basically wore out and caused the rotor to wobble and that’s put extra force on the spline shaft and that’s why it snapped like a carrot ..... cheap bearings
I imagine their QC missed the hardness of the metal. I presume the Steel purchased was improperly hardened and tempered. Brittle failure is usually from a material being too hard for its intended purpose.
i am sure those impacts have been abused, i have mine 2 years and still going strong, i see people use it day in day out, just like regular impact to remove wheels day in day out
As far as I know, CP has outsourced their guns to be Made In Taiwan. This is clearly the use of inferior materials. I have one rebranded as Rod Craft. However the weapon of choice in our shop is still the MG725 or the IR2135 TIMAX. Their failure modes are just loss of power over time, never catastropic failure like this. Some guns get gummed up with crap like water and oil. On the instruction manual on the MG725, it states oil very lightly and some guys put way too much. It ends up dropping the power of their guns as time goes on. It doesn't make sense to buy CP anymore.
Probably they were abused to get the same impact force as a full size wrench or were working at higher pressure. Also it is obvious that the shorter shaft does not have a space to twist and absorb impact.
these seem to get high ratings. I think it was abuse. There is not that much more length in the larger shaft to help . If it twists it will fatigue and break aver time.
Perfect explained!! Greetings from Colombia!
Thanks
I was one of the early buyers of one of these when they first came out, and it has been flawless, undoes things my big gun wont because of the higher impacts per minute seem to be more effective for some things.
Where I work we would shear off the splines like that on our 1" IR guns by running them at very high pressure (300+psi). I found that IR already had a solution they employed on their higher end models and that was to drill holes down the length of the rotors so it looks like the cylinder of a revolver. That reduces the inertia the rotor carries and keeps it from breaking itself like that.
And cool video btw.
I used a CP model 734 for appox 30 years and in that time i had to install 3 tune up kits. No parts failure except the air vanes wearing out and a couple of leaking gaskets.
You should do a file hardness test on the rotor shafts compared to your other impacts.
That's a pretty good suggestion.
@@ToolTeardowns it's not likely you're still reading comments from a 2 year old video, but: have you in fact tested the shaft of that rotor for hardness?
I have this gun and I use it professionally. I have used it for around a year. But I only use it when I need tok fit into small areas. So far so good
As someone already mentioned : too much pressure applied most likely. Another option - too long hammering process may also cause similar issues, but less likely
Mine has same failure. I would say it is a weak spot. Great video. Thanks.
Well this video sold me on the German Hazet mini impact.
MrDakkyz you should have went with the earthquake xt stubby from harbor freight
The aircat stubby it made by the same company as the HF and comes with a 2 year warranty, out the door for $105
It wonder if they use the same guts for the CP7732 1/2" drive as they do for the CP7731 3/8" drive, rated at 415 ft-lbs. Very coincidental that two of your samples sheared at the spline the same way- were they purchased from the same batch in production?
Have you ever done a tear down on a butterfly impact wrench? I've been trying to determine the failure on a HF sample that doesn't spin up but just vents air, but after taking off the end cap, the air motor doesn't simply drop out as easily as shown here, and there's no visible snap rings or anything holding it in. Maybe need to take a hydraulic press to it and press on the drive tip, but wanted to see if there's something I'm missing first.
I'm sorry to be such a fanboy but the premium for IR airtools pays for itself in longevity IMO. Great video, thanks.
Okay so the problem there is the two bearings are poor quality and they basically wore out and caused the rotor to wobble and that’s put extra force on the spline shaft and that’s why it snapped like a carrot ..... cheap bearings
I imagine their QC missed the hardness of the metal. I presume the Steel purchased was improperly hardened and tempered.
Brittle failure is usually from a material being too hard for its intended purpose.
i am sure those impacts have been abused, i have mine 2 years and still going strong, i see people use it day in day out, just like regular impact to remove wheels day in day out
I have a Chicago air tool, the trigger stays on and starts too shut off .. called the company.. left message, model cp734h..
yep this is common, great gun. any one know the replacement part number for the rotor?
As far as I know, CP has outsourced their guns to be Made In Taiwan. This is clearly the use of inferior materials. I have one rebranded as Rod Craft. However the weapon of choice in our shop is still the MG725 or the IR2135 TIMAX. Their failure modes are just loss of power over time, never catastropic failure like this. Some guns get gummed up with crap like water and oil. On the instruction manual on the MG725, it states oil very lightly and some guys put way too much. It ends up dropping the power of their guns as time goes on. It doesn't make sense to buy CP anymore.
Thanks for the comments. That's some interesting info.
Devin Smith help me hear if I were to invest in tools drills impact drills all sorts..What would you recommend..brand wise ..I appreciate quality..
Atlas Copco
Probably they were abused to get the same impact force as a full size wrench or were working at higher pressure. Also it is obvious that the shorter shaft does not have a space to twist and absorb impact.
Maybe the metal that they used in that model is flawed because if that's a molybdenum that's not going break even if you use it every day
one broken at the splines id call abuse but two exactly the same i call design defect.
Curious not a tool person..why are these pricy..is the quality better than what you can get at a hardware store
It is not cheap to replace that part...
I got the same Rodcraft 2202 design by Cp,now I will see how long will last
these seem to get high ratings. I think it was abuse. There is not that much more length in the larger shaft to help . If it twists it will fatigue and break aver time.
Stop buying crap
made in province of china