Robart incidence meter calibration

[Grow Pattern]

I have several of these devices including the digital version that I use in 
conjunction with the Robart ali-bars.

One thing that I did find was that the moldings of the plastic cases, 
containing the needles and scales, all had a slight concave bow to them. 
This proved to be what was causing the needle to stick. You can check it out 
by unscrewing each screw a turn and seeing how much easier the needle 
moves.The fix was to put some masking tape between the edges of the two case 
halves. This then allowed needles to move very freely.

The second tip is to try them at the store. You can readily see if the 
needles are "Sensitive" or not just by holding the packet in your hand. Buy 
the sensitive ones. (No joke intended)

lastly the unit does not work properly if leaning over to one side, Try and 
keep it vertical.

My "cured" ones will accurately show 1/4 of  degree. They all agree with the 
smart-tool readings. The smart-tool is a wee bit heavy and can/will cause 
the support clamps to leave marks. I use it sparingly or to set up things 
like the canopy deck is level etc.

I have the "laser" versions but they stick much more than the "needle" 
versions.

Regards,

Eric.


----- Original Message ----- 
From: "Don McCullough" <donald_mccullough at hotmail.com>
To: <discussion at nsrca.org>
Sent: Friday, February 04, 2005 9:03 PM
Subject: Re: Robart incidence meter calibration


> The first thing I did after trying to use a Robart meter is toss out the 
> meter part and keep the rest. I replaced the meter with a digital level. I 
> used the MACKLANBURG-DUNCAN 92346 SMARTTOOL - MODULE ONLY. It is about 
> $100 but really takes the pain out of using the Robart.
>
> Not only does the robart use a penny for a weight (too light), but it uses 
> a simple nylon bearing. Between the stiff bearing and the weight rubbing 
> against the case, I never could get anything approaching 1-degree 
> accuracy. The digital level is dead accurate to 1/10th of a degree and is 
> easily calibrated. It has a neat function, it will beep when it hits 
> zero -- very handy. Next I want to toss out that short bar and replace it 
> with a longer one.
>
> Don
>
> ----Original Message Follows----
> From: "Rick Kent" <knowhow3 at bellsouth.net>
> Reply-To: discussion at nsrca.org
> To: <discussion at nsrca.org>
> Subject: Re: Robart incidence meter calibration
> Date: Fri, 4 Feb 2005 15:33:37 -0500 (Eastern Standard Time)
>
> Ever taken a Robart meter apart? I did once (forget why), and found that 
> it
> actually uses a US penny for the counterweight!
> Interesting.
>
> Rick
>
> -------Original Message-------
>
> From: discussion at nsrca.org
> Date: Friday, February 04, 2005 01:32:48 PM
> To: discussion at nsrca.org
> Subject: Re: Robart incidence meter calibration
>
> Agree,
> And would add, always set up the level with the same side forward.
> If I swap my robart meter 180 degrees, it's off a bit.
> Ron Lockhart
>
> -------------- Original message --------------
> I don't even try to use the bubble level. As long as you set the 
> fuselage's
> datum line to what the meter itself says is zero, you can make all your
> other measurements relative to that reference. It then measures degrees + 
> or
> - from zero, not from level. Seems to work out OK for me. I do the same 
> for
> the GP laser incidence meter, which I find more accurate anyway.
>
> Rick
>
> -------Original Message-------
>
> From: discussion at nsrca.org
> Date: Friday, February 04, 2005 09:59:33 AM
> To: discussion at nsrca.org
> Subject: Robart incidence meter calibration
>
> Has any tried to calibrate their Robart incidence meter, or sent it back 
> to
> have it done? The bubble level appears accurate, but the meter is way off
> from where the bubble syas is level. I've checked it against two other
> levels, and the level bubble on the Robart meter is ok.
>
> Thanks.
>
>
>
> Jon A. Lowe
> Deputy Project Manager
> Close Combat Weapon Systems Project Office
> jon.lowe at msl.army.mil
> 256-876-5185
> DSN 746-5185
>
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