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Old 01-03-09, 05:16 AM   #1
Soil_Sampler
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Park TW-5 & TW-6

http://www.parktool.com/products/det...3&item=TW%2D5#

http://www.parktool.com/products/det...t=13&item=TW-6
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Old 01-03-09, 07:57 AM   #2
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And your question is?
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Old 01-03-09, 08:58 AM   #3
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What are you asking? If your question is which one to use the answer is both. The TW-5 is 1/4" drive and the TW-6 is 3/8 drive.
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Old 01-03-09, 09:10 AM   #4
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Get one or the other and then get a reducer or expander thingey from Sears/Craftsman.
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Old 01-03-09, 09:36 AM   #5
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They measure torque in completely different ranges so you want to get the one you specifically need. For most people, I think that means the low torque model.
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Old 01-03-09, 09:37 AM   #6
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^ I did not notice that, but you are right.
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Old 01-03-09, 09:48 AM   #7
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And your question is?
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What are you asking?

It is not a question, but the answer.
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Old 01-03-09, 10:17 AM   #8
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They measure torque in completely different ranges so you want to get the one you specifically need. For most people, I think that means the low torque model.
There is a slight overlap in torque coverage (3-15 vs 10-60) so I wouldn't say they are "completely" different ranges. Other than that, I agree, you should use the wrench that best fits the torque you need to apply.

Just a reminder about torque wrenches. Industry standard is to not use any setting below 20% of full scale because the accuracy of the tool goes out the window below 20%. So the usable range of 10-60 wrench is more like 12-60. If you're going to use a setting below 20% of full scale, you might as well not buy a torque wrench at all. Keep this in mind when looking at poor quality torque wrenches that have a scale of say 10-1000. If you think you are going to make an accurate torque at say 50 with this wrench then save your money ... it's usable range is 200-1000.

Determine the value you need to torque to and then use a torque wrench appropriate for the value.
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Old 01-03-09, 10:20 AM   #9
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Old 01-03-09, 10:42 AM   #10
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Actually, a usefull heads up about a product that is going to be released in February. Thanks Soil Sampler.
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Old 01-03-09, 10:43 AM   #11
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A review is useful. A link to a product is spam.
Woo a torque wrench. Nobody ever thought of that before.
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Old 01-03-09, 10:48 AM   #12
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Park Torque wrenches up till now have been beam type. This is their first foray into preset style clickers.
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Old 01-03-09, 10:50 AM   #13
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fair enough, but hardly a new idea. I will concede if you're a big park fan and you didn't happen to notice it on the newsletter
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Old 01-03-09, 10:54 AM   #14
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fair enough, but hardly a new idea. I will concede if you're a big park fan and you didn't happen to notice it on the newsletter
I don't even get the newsletter.
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Old 01-03-09, 12:21 PM   #15
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There is a slight overlap in torque coverage (3-15 vs 10-60) so I wouldn't say they are "completely" different ranges. Other than that, I agree, you should use the wrench that best fits the torque you need to apply.

Just a reminder about torque wrenches. Industry standard is to not use any setting below 20% of full scale because the accuracy of the tool goes out the window below 20%. So the usable range of 10-60 wrench is more like 12-60. If you're going to use a setting below 20% of full scale, you might as well not buy a torque wrench at all. Keep this in mind when looking at poor quality torque wrenches that have a scale of say 10-1000. If you think you are going to make an accurate torque at say 50 with this wrench then save your money ... it's usable range is 200-1000.

Determine the value you need to torque to and then use a torque wrench appropriate for the value.
What industry?

The only way to know is to conduct a linearity study. If the tool is properly designed you can use it through its full range.
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Old 01-03-09, 04:05 PM   #16
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The TW-5 runs from 2 to 11 foot/lbs. Not real useful on a steel or aluminum framed bike. If you're not working on CF, get the TW-6. bk
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Old 01-03-09, 10:46 PM   #17
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Park Torque wrenches up till now have been beam type.
This is their first foray into preset style clickers.
negative. They offered the TW-3 and TW-4 in the past.
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Old 01-03-09, 11:40 PM   #18
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I don't know what the original poster was after but I have had a question about these two wrenches for awhile. I think I need a torque wrench and I am a decent fan of Park Tools, can I get away with just one of these? And if so, which one? I will mostly be using this for home wrenching on steel frames with mid-range components. From the post above it sounds like the TW-6 is advisable.
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Old 01-04-09, 08:27 AM   #19
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What industry?

The only way to know is to conduct a linearity study. If the tool is properly designed you can use it through its full range.
Any government contract industry. The torque wrenches I use has it's accuracy verified (calibrated) at a certified lab. What standard do they use?? The vendor's specs. Respectable vendor's will not provide any accuracy specs for their wrenches below 20% of full scale. Why? Because there was a government MIL-STD that stated that torques could not be performed at settings below 20% of full scale because at some point below 20% the accuracy of the tool is not predictable nor repeatable ( ... "accuracy goes out the window" ...). This MIL-STD has since been cancelled due to the paper reduction act but not before most of our major government contractors got onboard and changed their company policies to meet the MIL-STD. As a respectable torque wrench manufacturer that wants to sell lots and lots of wrenches to the government and government contractors ... they will only guarantee the part of the "usable" range that meets the MIL-STD ( ie =/- %4 of IV from 20% - 100% of range).

Take a look at the SNAP-ON website. Look up your basic "clicker" torque wrench.
Use QD1R200 model number as an example.
Note that it has been certified to ANSI B107.14M-1994 and it's specs are " ... accurate to 4% clockwise and 6% counterclockwise from 20% of full scale to full scale."
They will not guarantee any accuracy rating below 20%. Why?? Because SNAP-ON wants to sell lots and lots of torque wrenches ... especially to the government and government contractors. In order to do this, they must guarantee there wrenches to the same spec the "industry" must meet (ANSI B107.14M-1994).

Is this overkill for torques performed on bicycles. Probably so. But ask yourself why you want to use a torque wrench on bicycles (or anything else for that matter). To apply the correct amount of torque.
Without knowing the accuracy of the tool at a specific setting, how do you know you are meeting the torque specs for the bicycle. If that's the case, why use a torque wrench at all.

I'm not saying not to use a torque wrench ... I'm saying don't "blindly" use a torque wrench. The advertised range of the wrench is not the only numbers you need to consider.
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Old 01-04-09, 09:03 AM   #20
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I don't know what the original poster was after but I have had a question about these two wrenches for awhile. I think I need a torque wrench and I am a decent fan of Park Tools, can I get away with just one of these? And if so, which one? I will mostly be using this for home wrenching on steel frames with mid-range components. From the post above it sounds like the TW-6 is advisable.
Why not have a look at the torque specifications for the components you intend to repair? If you don't have a stash of instruction booklets, the Park Big Blue Book (BBB-2) has a table of torque requirements. I think the newer edition Zinn books do too.
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