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Lyman Accutrimmer Instructions Manual

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    							LYMAN ACCUTRIMMER  INSTRUCTIONS
    A metallic cartridge case will stretch after a number of firings and it then becomes neces-
    sary to trim it back to its proper length so it will chamber properly. The Lyman AccuTrimmer
    will accept most popular cases. 
    To convert to another caliber, you need only change to the proper size shellholder and pilot.
    Lyman offers a complete line of shellholders and pilots.
    Mounting
    The base of your trimmer is drilled with offset holes for mounting directly to the top of
    your reloading bench without splitting the wood. This is the recommended method of mount-
    ing. Some reloaders prefer to clamp their trimmer in a vise when using it. If the trimmer is to
    be used in this manner, Lyman recommends that it be fastened to a block of wood. The wood-
    en block can then be held firmly in the vise jaws without damaging the base.
    Installing The Cutter And Pilot
    Thread the cutter onto the AccuTrimmer shaft until tight to
    the shaft. An easy method we use to ensure is to finger tighten
    the cutter to the shaft. Insert the hex head wrench into the pilot
    set screw and apply clockwise pressure on the handle while
    holding the wrench firmly.  When tight, the cutter is secure
    and ready to use. 
    The pilot is inserted into the hole at the center of the cutter.
    Loosen the set screw with the wrench provided until the pilot
    sits flush to the cutter. Tighten the set screw. Use caution, as
    the cutter edges are extremely sharp. IMPORTANT: Use the
    proper pilot as specified for use with your cartridge case. 
    Preparing The Cases
    Before trimming, cases must be full-length or neck resized and deprimed. Pilots are
    designed to be used with sized necks only.
    Measuring The Cases
    You will need an accurate means of measuring case length. We recommend Lyman preci-
    sion calipers. When your cases have lengthened to the point where they exceed the maximum
    case length allowable for your cartridge, they must be trimmed. For a list of  maximum case
    lengths” and suggested “trim to lengths” see your Lyman handbook. 
    						
    							Locking The Case In Place
    Place the appropriate shellholder into the shellhold-
    er retainer slot.
    Place your case into the shellholder. Slide the cutter
    shaft assembly, with the pilot installed in the cutter
    head, towards the case until the pilot enters the case
    mouth and push it in flush to the cutter head. Now,
    exerting slight pressure on the shaft, from the handle,
    tighten the case in place by turning the “T” handle
    clockwise until the case is tight. NOTE:  Excessive
    pressure is not required. You are now ready to trim
    your case.
    Adjusting The Cut
    A knurled lock ring with a set screw through the side provide for both fine and coarse
    adjustments.
    Advance the lock ring until it is close to the shaft bearing and tighten the set screw against
    the shaft with your hex wrench. 
    To adjust the fine cutting attachment, take your hex wrench and advance or retract the side
    set screw until you reach the  trimming amount.
    Hints  
    Adjust the cut a little at a time, checking your case length with your caliper after each cut.
    When the correct “trim to length” has been reached, you are now ready to begin processing all
    your cases.
    Processing Your Cases
    Once your AccuTrimmer is in adjustment, your entire lot of cases may be processed to
    bring them all to the correct length. As you turn the crank handle, keep an inward pressure on
    the cutter so that it is always bearing against the case mouth, but do not force it. After trim-
    ming, small burrs will be present on the case mouth. These can be easily removed from both
    inside and outside the case mouth with Lyman Deburring tools.
    Keep a master case
    When a reloader is working with several different calibers, it is wise to retain a master case
    of the correct length for each cartridge.
    This reduces adjustment time since the master case can be snapped into the shellholder and
    the cutter quickly brought into adjustment against its mouth.
    AccuTrimmer (continued) 
    						
    							1T-Handle Assembly    7993013
    2Shell Holder Retainer 7993003
    3Cutter Head Assembly 7822011
    4Cutter Shaft Boss 7993005
    58-32 x 3/8 Set Screw 7993008 
    68-32 x 1/8 Set Screw (2)  79944187Adjustable Stop Collar 7993020
    8Nylon Ball 7990076
    910-32 Socket Head 
    Cap Screw (2) 7993006
    10 Cutter Shaft Assembly 7994432
    11 AccuTrimmer Base    7993018Key  Part Description  Part # Key  Part Description  Part #
    AccuTrimmer (continued)
    Visit our complete Lyman website at 
    www.lymanproducts.com 
    						
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