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#31
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Would be interesting to know. And good to know about the snap on. I am currently in the market for a new torque wrench.
Thanks
Ed
Thanks
Ed
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#32
Rennlist Member
Still trying to get to the bottom of this issue between Snap-On and Precision. Spoke to a "technical specialist" at Precision last week. She didn't know the answer but was supposed to email me literature that would. Haven't received anything yet. I can't cite it off the top of my head, but recall reading on the Snap-On web site that, although less accurate in CCW than CW, it would still work CCW. I also called PMNA parts, thinking they actually supplied a wrench with new cups...apparently not. They suggested Snap-On. I'll post more as I learn more.
#33
Still trying to get to the bottom of this issue between Snap-On and Precision. Spoke to a "technical specialist" at Precision last week. She didn't know the answer but was supposed to email me literature that would. Haven't received anything yet. I can't cite it off the top of my head, but recall reading on the Snap-On web site that, although less accurate in CCW than CW, it would still work CCW. I also called PMNA parts, thinking they actually supplied a wrench with new cups...apparently not. They suggested Snap-On. I'll post more as I learn more.
#34
Rennlist Member
There IS a reason accuracy is different. I just don't know what it is. Here's a bit from one of the 3/4" electronic wrenches "• Torque Accuracy: +/- 2% CW and +/- 3% CCW, 20–100% of full scale". It's common for accuracy to vary with rotation direction but I don't know what about the design creates this. 3% is plenty accurate for wheel nuts, anyway. There are other factors that will affect the reading more than that.
I should clarify that the model I have, not all models, is CW only.
I should clarify that the model I have, not all models, is CW only.
#35
Rennlist Member
So it appears that only the split beam style (the ones you don't have to zero) are limited to CW measurement:
• A unique split-beam measuring element provides the accuracy and eliminates the heavy coil spring used in conventional click-type wrenches, which makes for fewer moving parts, reducing friction and wear to a minimum
• Designed for measuring torque in a clockwise direction only – wrench is not reversible
So if you need CW/CCW functionality go with the coil spring style that has to be zero'd when you are done, or electronic, which doesn't, but is overkill for wheel nuts. My Snap-on guy is down for a group buy if anyone is interested. PM me if so.
• A unique split-beam measuring element provides the accuracy and eliminates the heavy coil spring used in conventional click-type wrenches, which makes for fewer moving parts, reducing friction and wear to a minimum
• Designed for measuring torque in a clockwise direction only – wrench is not reversible
So if you need CW/CCW functionality go with the coil spring style that has to be zero'd when you are done, or electronic, which doesn't, but is overkill for wheel nuts. My Snap-on guy is down for a group buy if anyone is interested. PM me if so.
#36
There IS a reason accuracy is different. I just don't know what it is. Here's a bit from one of the 3/4" electronic wrenches "• Torque Accuracy: +/- 2% CW and +/- 3% CCW, 20–100% of full scale". It's common for accuracy to vary with rotation direction but I don't know what about the design creates this. 3% is plenty accurate for wheel nuts, anyway. There are other factors that will affect the reading more than that.
I should clarify that the model I have, not all models, is CW only.
I should clarify that the model I have, not all models, is CW only.
It is literally the same mechanism in both directions - only diff is if the head points to the left or the right when you look down the shaft.
EDIT:
It's possible the TQR600E head is CW only. Not sure why. However, My C4D600F definitely does both CW and CCW.
Last edited by Thales; 06-12-2018 at 12:15 PM. Reason: Updated Info
#37
Rennlist Member
Kevin, I agree it would seem silly not to put a second hole in especially if it creates a limitation not to. That said, there must be a design limitation that causes them to do this. I'll either disassemble mine or call the guys who calibrate them.
#39
Rennlist Member
So it appears that only the split beam style (the ones you don't have to zero) are limited to CW measurement:
• A unique split-beam measuring element provides the accuracy and eliminates the heavy coil spring used in conventional click-type wrenches, which makes for fewer moving parts, reducing friction and wear to a minimum
• Designed for measuring torque in a clockwise direction only – wrench is not reversible
So if you need CW/CCW functionality go with the coil spring style that has to be zero'd when you are done, or electronic, which doesn't, but is overkill for wheel nuts. My Snap-on guy is down for a group buy if anyone is interested. PM me if so.
• A unique split-beam measuring element provides the accuracy and eliminates the heavy coil spring used in conventional click-type wrenches, which makes for fewer moving parts, reducing friction and wear to a minimum
• Designed for measuring torque in a clockwise direction only – wrench is not reversible
So if you need CW/CCW functionality go with the coil spring style that has to be zero'd when you are done, or electronic, which doesn't, but is overkill for wheel nuts. My Snap-on guy is down for a group buy if anyone is interested. PM me if so.
This is a nice Snap On. Also over $1000 https://store.snapon.com/Standard-Mo...--P642512.aspx
#40
Rennlist Member
I'm referring specifically to Snap-on branded wrenches, so it is correct. I don't have a relationship with Precision and can't speak to their functionality.
#41
Rennlist Member
Here's what I was referring to from the Snap-On website regarding their model QD4R600A
Description
• Torque: 120–600 ft-lb
• Virtually maintenance-free sealed ratchet heads keep out dirt and moisture
• Cannot be accidentally disassembled if wound down past scale
• Accurate readings to ±4% CW and ±6% CCW from 20% of full scale to full scale
Bob, Is the Precision unit you use the C5D600F (a 1" drive)?
Description
• Torque: 120–600 ft-lb
• Virtually maintenance-free sealed ratchet heads keep out dirt and moisture
• Cannot be accidentally disassembled if wound down past scale
• Accurate readings to ±4% CW and ±6% CCW from 20% of full scale to full scale
Bob, Is the Precision unit you use the C5D600F (a 1" drive)?
#42
Rennlist Member
Hi Greg,
No, to be clear, I'm using the Snap-on TQR600, which is the series that is not rated for CCW use. Viperbob1 and I are questioning why what looks to be a similar Precision wrench does CCW. Snap-on owns CDI but I don't think they own Precision. https://www.snapon.com/EN/Our-Company/Our-Brands
Precision had a patent for the split-beam design that allowed accuracy in both directions so perhaps that it why the similar design Snap-on is unidirectional. That patent may have run out by now - I don't know.
Most of the other Snap-on wrenches are bi-directional. I'm using 3/4" drive.
Bob
No, to be clear, I'm using the Snap-on TQR600, which is the series that is not rated for CCW use. Viperbob1 and I are questioning why what looks to be a similar Precision wrench does CCW. Snap-on owns CDI but I don't think they own Precision. https://www.snapon.com/EN/Our-Company/Our-Brands
Precision had a patent for the split-beam design that allowed accuracy in both directions so perhaps that it why the similar design Snap-on is unidirectional. That patent may have run out by now - I don't know.
Most of the other Snap-on wrenches are bi-directional. I'm using 3/4" drive.
Bob
#43
Rennlist Member
#45
Rennlist Member
Hi Greg,
No, to be clear, I'm using the Snap-on TQR600, which is the series that is not rated for CCW use. Viperbob1 and I are questioning why what looks to be a similar Precision wrench does CCW. Snap-on owns CDI but I don't think they own Precision. https://www.snapon.com/EN/Our-Company/Our-Brands
Precision had a patent for the split-beam design that allowed accuracy in both directions so perhaps that it why the similar design Snap-on is unidirectional. That patent may have run out by now - I don't know.
Most of the other Snap-on wrenches are bi-directional. I'm using 3/4" drive.
Bob
No, to be clear, I'm using the Snap-on TQR600, which is the series that is not rated for CCW use. Viperbob1 and I are questioning why what looks to be a similar Precision wrench does CCW. Snap-on owns CDI but I don't think they own Precision. https://www.snapon.com/EN/Our-Company/Our-Brands
Precision had a patent for the split-beam design that allowed accuracy in both directions so perhaps that it why the similar design Snap-on is unidirectional. That patent may have run out by now - I don't know.
Most of the other Snap-on wrenches are bi-directional. I'm using 3/4" drive.
Bob
And you would suspect wrong.... The Precision does CW and CCW. I use for all 991 Cups center locks. Albeit a little quirky, but works fast and fine...