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HomeAircraftHelicopterHelicopter Main Discussion › You Use A Torque Screw Driver?
09-05-2013 09:46 PM  5 years agoPost 1
icanfly

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ontario

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Ca-mon, tell me you don't have a torque screw driver in your tool kit? Pretty expensive but well worth the investment when you later break bolts, screws, strip heads, mess with slots and channel lock pliers, fool butchery at the end of the day. I got a few busted screws which will not be removed without nearly destroying the part they're bound in.

My v8 and motorbike engine building experience mandated torquing heads and gaskets to spec with a 1/2in torque wrench. Now if I were to build a high performance machine of any consequence my heart would rest assured no bolts or screws or whatever needs tightening would go un torqued to a bolt's specific strength. That way I know I haven't damaged it when tightening by hand. And head bolts are not recommended for re-use once they have stretched to reach the torque limit assigned to them, how'bout them apples.

Have you not bought, say,,,,,, a bicycle, and bolts were loose or over tightened? Same goes for rc helis. Mind says that if you can't remove a screw because it is locktite'd but you are unsure, you would safely find out without destroying the head or snapping the bolt by using a torque screw driver which will spin around when it has reached the set strength limit of said bolt (just under actually).

In all my days on any heli forum I have not seen a single solitary soul or zombie step forth and proclaim "I USE A TORQUE TOOL TO ASSEMBLE MY HELICOPTER"

They're expensive, teehee.

GOOD---------DAY

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09-05-2013 09:50 PM  5 years agoPost 2
Jeff polisena

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westpalmbeachflorida usa

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I guess I have a good sense of torque ,I have no problems with getting bolts loose on my heli after I build .

I stole it ,flew it and gave it back ;)

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09-05-2013 09:57 PM  5 years agoPost 3
qraptor

rrApprentice

Illinois

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^^

And the problem with using a torque wrench is that we don't know the kit manufacturer's recommended settings.

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09-05-2013 09:59 PM  5 years agoPost 4
Dr.Ben

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Richmond, VA, USA

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I can build a model fine without one, but the fact is that every model I build has all its screws precisely torqued to the appropriate amount. As a rule, smaller fasteners are grossly overtorqued due to handle size, and large screws 4mm and larger are generally undertorqued.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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09-05-2013 10:30 PM  5 years agoPost 5
Ace Dude

rrProfessor

USA

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I have one, er, two. The good ones are expensive, but show up occasionally here for sale. They are on eBay as well. I mostly use them for head bolts on my model engines.

  

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09-05-2013 10:33 PM  5 years agoPost 6
Einzelganger

rrKey Veteran

Campbell, Texas

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^^^^^+1

I don't have one but it would be handy on head bolts and especially muffler screws.

Wayne

I love the smell of nitro in the morning.
RIP Roman

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09-05-2013 10:34 PM  5 years agoPost 7
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I have never seen torque driver which would fit 1.5mm or 3.0mm SHCS.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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09-05-2013 10:36 PM  5 years agoPost 8
Tyler

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Chicagoland area

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Useless without specs on required torque.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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09-05-2013 10:36 PM  5 years agoPost 9
R.J.

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SF bay area, CA USA

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I have two, a Tork-it screwdriver and a Klein. Having said that, I mostly use it for re-assembling nitro engines like Ace Dude.

http://www.kleintools.com/catalog/t...que-screwdriver

I have been using these values from the Tork-it instructions:

Recommended Maximum Torque (steel screws into aluminum)

Screw Size/ Torque/ Socket Size

2.0 mm/ 5-7 in-lb/ 1.5 mm

2-56/ 6-8 in-lb/ 5/64"

2.5 mm/ 8-10 in-lb/ 2.0 mm

4-40/ 12-14 in-lb/ 3/32"

3.0 mm/ 13-15 in-lb/ 2.5 mm

5-40/ 14-16 in-lb/ 3/32"

6-32/ 17-21 in-lb/ 7/64"

4.0 mm/ 20-24 in-lb/ 3.0 mm

8-32/ 22-26 in-lb/ 9/64"

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09-05-2013 10:39 PM  5 years agoPost 10
RyanW

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Edmond, Oklahoma

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Yes, I use mine on all my builds- https://rc.runryder.com/t743715p1/

You can get by with "feel" on a lot of things, but when assembling 'plate frame' mechanics I feel it is essential to have consistent torque on the fasteners to keep the frame from being tweaked.

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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09-05-2013 10:55 PM  5 years agoPost 11
Ace Dude

rrProfessor

USA

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Some torque specs can be found here:

http://torkit.com/faq.aspx

  

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09-05-2013 10:57 PM  5 years agoPost 12
Ace Dude

rrProfessor

USA

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I have never seen torque driver which would fit 1.5mm or 3.0mm SHCS.
Hex bits into a 1/4" drive is what most torque screwdrivers use.

  

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09-05-2013 11:01 PM  5 years agoPost 13
RICHW

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Cupertino, CA

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I have a simple rule for tightening bolts or glo plugs:

As tight as you can get it, plus two turns.

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09-05-2013 11:20 PM  5 years agoPost 14
icanfly

rrElite Veteran

ontario

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smaller fasteners are grossly overtorqued due to handle size, and large screws 4mm and larger are generally undertorqued.
Well, believe it or not, some people under torque bolts and screws, and yes, on a nitro engine it is good practice to use a torque screw driver.

It's not impossible to devise a 1.5/3mm driver bit if so required. I know if I go specialty hardware I'm going to live by the torque ratings on the fastener. Every metal fastener has a tensile strength chart.

It's aviation and anything to calm ones fears of not tightening a feathering shaft bolt, or of breaking one or Jesus bolt or what have you vital bolts and or screws, enough can only add to ones sense of self preservation.

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09-06-2013 01:06 AM  5 years agoPost 15
RyanW

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Edmond, Oklahoma

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Having the correct torque specs is good, but honestly there isn't a lot of information on how much torque to put on a matrix of steel screw, aluminum beauty washer, 2mm carbon plate into a piece of aluminum. I assemble a few fasteners to get a feel of what it good, then duplicate it with the torque wrench. If it is way off up or down of the "normal" torque spec for 3mm machine screws, then I may adjust.

For nitro motors, I always take the screws apart on the head and backplate with the torque wrench and make a note on the manual of what they were when I go to reassemble it. On YS motors you typically don't see a variation of more than 1 Lb-In. If memory serves me correctly, I think the head bolts are usually in the 15-16 Lb-In range and backplate screws around 6 Lb-In.

-Ryan
Mikado USA, Kontronik, Opti-Power, MKS Servos

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09-06-2013 01:14 AM  5 years agoPost 16
Justin Stuart (RIP)

rrMaster

Plano, Texas

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I have never damaged a McMaster Carr 12.9 SCHS, but I have twisted the head off Align SHCS and stainless steel socket head cap screws before.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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09-06-2013 01:35 AM  5 years agoPost 17
GREYEAGLE

rrElite Veteran

Flat Land's

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Used a couple in industry - had a few usually as samples', usually for instrument work or other tool repair - that's got to be certified and signed off but never for Heli's :

I've alway's gone by feel :Also Knowing something about the quality and origin/ quality of the bolt and condition of the hole.

Re : those crap 450 frame screw's made out of a old pie pan.
Or a gum rubber one that could go into a swash.

Some of the Stuff is so far off tolerance hole size or thread quality, or screw material alloy you can get into a mess really quick. Their standards are not our ASME standard's or ISO qualified.

Sorry but that's a pain, it's not the torque driver.

Some of the tapped holes their production tap's are so shot they immediately will ruin a good screw from being undersize.

I chase a lot of holes with HSS tap's I trust.

What I do use is Long wire metric T- Handles - Non - plastic handles.

They spring back - or you can feel them wind up so to speak - so you develop a feel for em.

greyeagle

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09-06-2013 01:45 AM  5 years agoPost 18
jgunpilot

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Pollock, LA

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I use German Torque: "Gutentight."

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09-06-2013 02:35 AM  5 years agoPost 19
McKrackin

rrProfessor

Lucasville,Ohio

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Just past snug and trust the Locktite to do it's job.

Works great

I literally never use the word literally right.

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09-06-2013 03:14 AM  5 years agoPost 20
Dr.Ben

rrMaster

Richmond, VA, USA

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Another way I use my torque wrench is on extremely delicate threaded pieces that might be easy to strip. I will hand snug one fastener as tightly as I want it, then calibrate the wrench to or a fuzz less than that. I can then do all the rest consistently and little or no fear of going too far.

The specs included with the Tork-It have proven to be functionally quite valid EXCEPT the 2mm spec is generally too much for such hardware into aluminum parts.

Ben Minor

Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA

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HomeAircraftHelicopterHelicopter Main Discussion › You Use A Torque Screw Driver?
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