Thanks, solved

bertn

bertn

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I have a used sizemaster here that does not resize the base.
The sliding bar (inside the main shaft) is connected at the bottom to the lever that brings the collet around the fingers up so that looks good.

At the top the sliding bar has a "hook" at the back that is supposed to be engaged by the handle action to move the sliding bar down but the hook is all the way up so the handle action is not engaging the hook so no resizing takes place.

If I manually move the hook a bit down so it is gets pushed down at a handle stroke it works but when the handle is pushed all the way back up then the hook moves too far up again and is again not pushed down at the next downstroke.

Hope someone can explain how it is supposed to work.
I found a mec manual online but could not find it in there.

 
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the hook looks like it is bent downward, if it were straight would it be engaged correctly by the horizontal linkage?
 
barsik said:
the hook looks like it is bent downward, if it were straight would it be engaged correctly by the horizontal linkage?
Click to expand...

just got a pm from another cgn-er (thx!) who does not thinks that it is bent but it the collet that needs adjustment.

I will try but have a hard time believing I can bring the hook down enough with this adjustment and that it must be something else since the collet does not even gets activated/engaged now since the sliding bar stays all the way at the top.
 
Its been a while since I owned a sizemaster but I do not recall the actuator rod haveing that much bend at the end . Seems to me it should be more of a 45 degree bend . in your pic it appears to be bend to 90 degrees . have a look at the mec site at the parts lists or perhaps they have a schematic .
 
I own 5 sizemasters none of them have that rod also not shown in my manuals . Clean and adjust the collect is were i would start but first make sure the press is not set up for 3 inch shells. simple check resize a 3 inch and see if it works . Also check the position on the main post it should be on the lower hole , no spacer on the prime punch and primer seat unit for 2 3/4 shells.
 
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warzaw said:
I own 5 sizemasters none of them have that rod also not shown in my manuals . Clean and adjust the collect is were i would start but first make sure the press is not set up for 3 inch shells. simple check resize a 3 inch and see if it works . Also check the position on the main post it should be on the lower hole , no spacer on the prime punch and primer seat unit for 2 3/4 shells.
Click to expand...

thank, fingers are clean and lubed between collet and fingers.
i will check the 3 inch setting.

The thing i need to know is how the vertical sliding bar normally works so lets say if i just operate the handle a full stroke (without an empty hull and regardless of hull length setting of the press) is the collet resizer squeezing shut?
(mine does nothing in this scenario)
 
My sizemasters use a bar with a small ledge to activate similar to what you have but more rigid than your lever . If your press is set up for 2 3/4 shells i would think the lever on your press is bent if you straighten it out and it doesn't hold you will have to upgrade to the new shaft and lever .
 
it is model SM77 by the way.

press is set up for 2 3/4.

here another picture of the "hook" but then from a horizontal position. by looking at the angle that is cut at the end of the hook i'd say this is how it is supposed to be.

 
That bar and link activate the lever on the sizer your problem is in the length of the linkage to sizer linkage. Look behind the press when you pull the lever down and you will see what i am talking about looks like you are coming up short on the length of travel. . Old presses are not always a great deal.
 
I have a pair of sizemasters, and it looks like your actuator rod is bent and out of position. It belongs further down the column (part # 69).

HnxVvTf.jpg


The bottom of part #67, the actuator rod should be in contact with the part #82 the return bracket. also there is a serious bend in your actuator rod, it should only have a small 30° (app) bend at the top.

https://www.mecoutdoors.com/sizemaster-parts

https://www.ballisticproducts.com/MEC-Actuator-Rod-8310/productinfo/1308310/
 
nitro-express said:
I have a pair of sizemasters, and it looks like your actuator rod is bent and out of position. It belongs further down the column (part # 69).

HnxVvTf.jpg


The bottom of part #67, the actuator rod should be in contact with the part #82 the return bracket. also there is a serious bend in your actuator rod, it should only have a small 30° (app) bend at the top.

https://www.mecoutdoors.com/sizemaster-parts

https://www.ballisticproducts.com/MEC-Actuator-Rod-8310/productinfo/1308310/
Click to expand...

BINGO we have a winner.
 
warzaw said:
That bar and link activate the lever on the sizer your problem is in the length of the linkage to sizer linkage. Look behind the press when you pull the lever down and you will see what i am talking about looks like you are coming up short on the length of travel. . Old presses are not always a great deal.
Click to expand...

have not yet completely figured out what you mean but you might be right.
looks like there is another hole in the main shaft so maybe the whole shaft should be brought down about 1/2 inch.


but by doing this then there would not be enough distance between baseplate and dies...

anyone of you having the same hook in your press? not the mild 30 degree angle like on the drawing?
is there supposed to be some sort of stop to prevent the actuator bar from moving too far up un the return/up stroke?

Argh...my hornady 366 is so much simpeler lol

 
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That hole is set up correctly for 2 3/4 inch hulls that is not your problem. Look at the back of the press pull the lever down and see were you are coming up short the sizer distance you have a broken or missing pin or bolt or something is bent . That shaft has to come in contact with the sizer levers.
 
Thanks Warzaw. Nothing looks missing or bent.

here two pictures from the back in full upstroke and downstroke.

downstroke goes all the way and closes the fingers nicely so that looks good.
upstroke goes too far up it looks (barely gripping onto the bolt on the actuator arm) so that is why i am thinking that somehow an endstop for the actuator bar in the up stroke is missing.



 
Your travel down is good up looks to high . check the base in the sizer it is set to high up maybe something stuck in the base? I think you have found your problem get the sizer base lowered .
 
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I am positive that the sizer itself sizes fine.
When the hook on the actuator bar is pushed down by the bolt in the handle linkage it works good.

The actuator bar moves too far up at the moment on the upstroke so the bolt in the handle linkage can't grab the hook to push it down on the next downstroke.
Just hope to find out what the upstroke stop or limit should look like.
 
warzaw said:
Lower the base in the sizer die it is threaded the collect will move down. Everything else is in place according to the last set of pics you posted.
Click to expand...

i did lower it a bit but it is not helping.
by doing so the fingers close too soon so they are all the way closed before the downstroke is finished and then the dies won't even come down far enough.
 
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