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Author Topic: Working on a torque driver  (Read 668 times)

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Offline peternap

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Working on a torque driver
« on: October 31, 2009, 03:34:37 PM »
Sometimes the simplest ideas are the best (Sometimes they're stupid too  ;D)

Since I'm still a receiver short, I'll be swapping barrels some. I thought about a homemade torque driver the other day and came up with a few ideas. spring loaded detents, opposing wing washers,etc, then I looked at one of my cheap torque wrenches. It's just a spring loaded head with an indicator and a scale.

I dug around in my spring stock box and I had some pieces  from a wire pulling snake that I use for V springs.

The idea hit me that I could take a piece of that, drill a hole in an old replaceable blade  driver handle (Like a springy T handle, mount a movable indicator on the handle and I'd be done. Just set the indicator where you want and use the T handle until the tips of the T, touched the indicator points.

As soon as I get time to weld two pieces of bicycle spoke on a nut with a set screw in it, to use as the indicator...I'll give it a try.
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Offline 45454

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Re: Working on a torque driver
« Reply #1 on: October 31, 2009, 07:36:51 PM »
Necessity is the mother of inventions. ;D
Hope it works better than expected.
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Offline c1skout

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Re: Working on a torque driver
« Reply #2 on: November 01, 2009, 04:20:20 AM »
Sounds great, post up some pics when it's done.
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Offline PHATINJUN

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Re: Working on a torque driver
« Reply #3 on: November 01, 2009, 06:33:15 AM »
Not trying to rain on your parade but if this don't work for you .Midway has the FAT wrench on sale for $41 thats what I paid for mine from SG 2yrs ago. Kurt
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Offline quickdtoo

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Re: Working on a torque driver
« Reply #4 on: November 01, 2009, 06:42:49 AM »
Kurt makes a good point, it's neat to make something yourself that works,  besides the FAT wrench, Ebay sells used Uticas regularly, I bought several in a couple batches for under $40 shipped, a couple were worn out, but the rest were quickly recalibrated using an automotive type torque wrench and have been working for several years now, I keep one in my Handi travel case, another in my shooting box and one on my workbench.

Tim
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Offline peternap

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Re: Working on a torque driver
« Reply #5 on: November 01, 2009, 09:01:17 AM »
Quote from: quickdtoo on November 01, 2009, 06:42:49 AM
Kurt makes a good point, it's neat to make something yourself that works,  besides the FAT wrench, Ebay sells used Uticas regularly, I bought several in a couple batches for under $40 shipped, a couple were worn out, but the rest were quickly recalibrated using an automotive type torque wrench and have been working for several years now, I keep one in my Handi travel case, another in my shooting box and one on my workbench.

Tim

That's true Tim, but there are a couple of issues. First, I make many of my own tools. I even built my own lathe. I'm one of the few people in the state that can forge and rifle their own rifle barrels. The gunsmiths at Colonial Williamsburg are the other exceptions. They're also better at it than I am. I make all my own inletting chisels because I know they work. When I was building AR receivers, many of us took a great deal of pride in doing what everyone else said wouldn't work.

Second, I never buy anything off of Ebay. I consider it sinful to offer any support to an antigun organization. I have zero tolerance for that.

Third, I enjoy doing it and that's a big part of the sport to me. As far as hunting, I could live with a 12 Gauge shotgun and never feel handicapped. Add my 1911 and I don't have to have any other guns. I just do for the enjoyment of it.

That's not to say that others who want to buy tools are wrong. They're not! Some of us just prefer to take a different fork in the road ;D
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Offline jeepmann1948

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Re: Working on a torque driver
« Reply #6 on: November 01, 2009, 03:08:18 PM »
Might go ahead and splurge for one of these.........

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=66269

Cheaper than a cup of Starbucks ;D
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Offline peternap

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Re: Working on a torque driver
« Reply #7 on: November 01, 2009, 03:21:04 PM »
Quote from: jeepmann1 on November 01, 2009, 03:08:18 PM
Might go ahead and splurge for one of these.........

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=66269

Cheaper than a cup of Starbucks ;D

Saw them the other day. I expect it may last.....two days ;D
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Offline fye2k

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Re: Working on a torque driver
« Reply #8 on: November 02, 2009, 03:53:47 AM »
Quote from: jeepmann1 on November 01, 2009, 03:08:18 PM
Might go ahead and splurge for one of these.........

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=66269

Cheaper than a cup of Starbucks ;D

That is set at just under 4 1/2 ft.lbs.  Is that tight enough for the fore end?
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Offline peternap

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Re: Working on a torque driver
« Reply #9 on: November 02, 2009, 04:31:39 AM »
Quote from: fye2k on November 02, 2009, 03:53:47 AM
Quote from: jeepmann1 on November 01, 2009, 03:08:18 PM
Might go ahead and splurge for one of these.........

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=66269

Cheaper than a cup of Starbucks ;D

That is set at just under 4 1/2 ft.lbs.  Is that tight enough for the fore end?

I don't know!
I'm using the "That's about right" method now and I suspect snug is good enough just as long as it's consistent and repeatable.
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Offline quickdtoo

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Re: Working on a torque driver
« Reply #10 on: November 02, 2009, 05:58:27 AM »
4.425 foot/pounds = 53.1 Inch/pounds which is about twice what I set them at, the forend stud is just resistance welded, it has been known to come off, I would put any more pressure on the screw than necessary, I use 25 inch/pounds.

Tim

http://www.unitconversion.org/energy/inch-pounds-to-foot-pounds-conversion.html
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Offline mtbugle

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Re: Working on a torque driver
« Reply #11 on: November 02, 2009, 06:14:59 AM »
Not sure how consistant but think fairly I think, and not a lot of torpue. I use my thumb and middle finger tips to torque end of screwdriver handle. Not able to over torque by much I think by using this method. Maybe someone with a inchpound torque wrench could give an idea of what amount of torque this is.
Thanks Don.
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