lyman ohaus m5

[mebe007]

Picked one up local. No directions. Can someone tell me how to properly set up?

[GLL]

Try this :

http://us.ohaus.com/us/en/home/support/discontinued-product-manuals.aspx

Then hit "click here" and search down the page for "m5".

The original set-up manual will download as an Adobe Acrobat file.

Jerry

[mebe007]

yeah thats whats weird no matter what i do i cannot get it to zero with the scale pan. also the hanging piece that you set the scale pan on is there supposed to be something in it? something in there rattles.

[TNsailorman]

Send me your name and address and I'll scan and print a copy of my M5 instruction sheet and mail it to you that I still have with my 1960's scale. James

[mebe007]

here you can see it wont zero with pan
http://i42.photobucket.com/albums/e322/mebe007/2012-09-20_18-40-52_278_zpsbb3a31d0.jpg

here is with another pan i had in the reloading room and its too light.
http://i42.photobucket.com/albums/e322/mebe007/2012-09-20_18-41-31_535_zpse406a789.jpg

starting to think i got screwed

[garrisonjoe]

Looks like that scale is in nice shape. Probably someone tinkered with the shot weights in the bottom of the pan support, which is what the factory used to get the pan and beam to zero initially. I'll bet you can take a few pellets out until you get zero on a level table surface.

You should invest in a set of check weights, but you can always use the "500 grain extra" weight (on the left side inside the leveling screw) as a top end check weight. Zero your scale with the empty pan, then check the "measured weight" of that extra weight bob placed in the pan. If close to 260.9 grains (stamped on the weight as "actual", you are golden (at least, that is what my two high-capacity weights weigh).

You should look at the steel pivot points (looks like upside down triangular beam perpendicular to the main scale beam) and the agate pivot sockets (in the vertical post) to make sure they aren't bent or chipped, but otherwise, hard to mess up that classic Ohaus M5.

Still using my 45 year old M5, and have a backup in case the first one fails in the next 40 years.

[1hole]

"here you can see it wont zero with pan"

You have what many of us consider the best reloading scale Ohaus ever made and Ohaus makes the best.

As your two pans show, the pan matters and you simply have a substitue that's heavier than the original. There are small weight under the center of the pan hanger that allow for a rough zero to match the pan.

Adjust your scale body to visual level with the left hand jack screw.

Remove the pan hanger screw and cover, put them and the hidden weights in your pan of choice and place it all on the scale normally. Add or remove enough of the weight bits until the beam zeros or is very close to zero. Place the weights back under the cover and screw the cover in place. Put it all back together and you will be able to zero properly.

The brass weight in the jack screw's cup has a weight stamped on it, use it for a normal check weight; my bet would be it will read dead on unless the pivot knife edges are dull or dirty. IF you ever wish to weigh something heavier than 500 gr. hang the weight on that peg that sticks out from the left end and balance the beam with your object then add 500 to whatever the poise sliders indicate.

There is no maker support for scales that old. If you have any damage it would be good to have a pro 'tune it up'. There is a well regarded guy who does that for a nominal fee, if you need to send it to him send me a PM and I'll give you the address.

[mebe007]

everything is clean and chip free. i will try adjusting the weights as recommended and see where that gets me.

[mebe007]

ok so i had to play with it like suggested, had to remove some shot and didnt have anything to add different weights except some .177 pellets so i removed some shot added a pellet then fine tuned it. i think im close.

http://i42.photobucket.com/albums/e322/mebe007/2012-09-20_22-58-45_639_zps27e89949.jpg

check weight read 260.9gn
http://i42.photobucket.com/albums/e322/mebe007/2012-09-20_23-03-00_905_zps40b0ee7f.jpg
http://i42.photobucket.com/albums/e322/mebe007/2012-09-20_23-02-51_700_zps8f903e52.jpg
http://i42.photobucket.com/albums/e322/mebe007/2012-09-20_23-03-10_853_zpse706a698.jpg


is this good, yea or nea? what are the intervals of the scale? is each line 5 grains on the big part?

[1hole]

"is this good, yea or nea? what are the intervals of the scale? is each line 5 grains on the big part? "

Yep, and it don't get no better. The left notches are 5 gr, the right notches are .1 gr. I was thinking the check extender/weight was 260.9 gr. but it's been so long since I used it I wasn't sure.

One thing that can cause a little trouble with any scale is the beam can get slid forward or back enough for the pivot bar to rub against the metal clips holding the agate V bearings, the friction will keep the beam from fully balancing. If you see the effect of beam drag all you gotta do is center the beam in the bearings. And DO NOT try to 'fix' those loose bearing blocks in place, they are made to float and should be left that way!

Good luck! :)

[GP100man]

I have 2 sets & one was shipped with the pan still in the wrapper & had to zero it the same way !

I like to put a bend in the hanger(more vertical) to ensure it`s not riding on the beam stirrup & off setting COB which will affect accuracy of the scale .

[o6Patient]

I have an rcbs 510 and an Ohaus 1010 and one of these, you'll end up reaching for the M5 more often.
Looks to be in great shape. Decide on which pan you want to use and regulate it with the lead shot
inside the pan holder- piece of cake.