Lyman Universal Trimmer Instructions Manual
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THE UNIVERSAL CASE TRIMMER 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 Universal Case Trimmer accepts all U.S. metallic cases. To convert to another caliber you need only change the pilot. Also included is an Allen wrench, which fits the lock screws in the adjust- ment rings and cutter head.. Mounting The base casting is drilled so the trimmer may be fastened directly to the top of your reloading bench. This is the recommended method of mounting. 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 wooden block can then be held firmly in the vise jaws without damaging the base casting. Installing the Pilot Loosen the lock screw on the case trimmer’s cutter head, open the package containing the Universal Trimmer pilot and insert it all the way into the cutter head (see Figure 13). Now tighten the lock screw. Preparing the Cases Before trimming, cases must be full-length or neck-resized and deprimed. Pilots are designed to be used only with sized necks. Measuring the Cases You will need an accurate means of measuring case length. We recommend that a good vernier caliper be used. 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 chuck lever in “open” position and slip the head of your unprimed cartridge case into the chuck head as pictured in Figure 14 (pg 38). By pressing the rim of the case against the side of the Insert pilot into cutter head and lock in place with allen wrench. Figure 13.
steel alignment ball, the case will snap into position with the cams engaged in the extractor groove. Be cer- tain the case is straight and that both cams are engaging evenly. Slide the cutter shaft in so the pilot enters the neck of the case and cutter face is touching the case mouth. Then, rotate the check lever to “lock” position. Do not use excessive force when locking the chuck. Slight thumb pressure on the lever is sufficient to hold the case firmly. Leave the pilot and cutter in this posi- tion as you proceed to adjust the trimmer. Adjusting the Cut Two knurled adjustment rings, located on the cutter shaft (see Figure 15). provide for both fine and coarse adjustments. Before making any adjustments, hold the large ring with your finger and turn the small ring counterclockwise, four full turns. This will leave about 3/32 space between the rings and allow room for fine adjustment. Make certain the cutter face is still positioned against the case mouth and slide the adjustment rings in tight against the side of the base casting. Tighten the lock screws in the small ring. Later models have a series of indicators each representing .001 inch of travel on the shaft. Used as reference marks, they enable the user to return to an approximate setting for various cases without time consuming trial and error testing. Adjust the cut a little at a time, checking your case length with the vernier caliper after each cut. When the correct “Trim-To Length” has been reached, tighten the lock screw in the large ring. Processing Your Cases Once the trimmer 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. Variations in finished case length would likely be caused by inconsistent pressure applied against the cutter head during the trimming process. If the case mouth sticks against the cutter head after trimming either too much pressure is being used or the pilot is not installed firmly against the cutter head. After trimming, small burrs will be present on the case mouth. These can be easily removed from both inside and outside the case mouth with your Lyman Deburring Tool. 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 chuck and the cutter quickly brought into adjustment against its mouth. Both fine and coarse length adjustments are provided. Half turn of chuck lever locks case firmly in place. LOCK Figure 14 Figure 15 Universal Case Trimmer (continued)
Maintaining the Trimmer Powdered graphite or light oil on the cutting shaft will provide proper lubrication for smooth operation. A light film of oil or grease will protect steel parts against rust. Power Adapter Instructions An optional adapter is available to quickly and simply convert your Universal Case Trimmer to a power trimmer (Item #7862001). To install, first securely mount the case trimmer on a bench or table. Unscrew the cutter head from the Universal Trimmer shaft and slide it out of the trimmer body. Next, remove the cutter head from the Power Adapter and slide the Power Adapter shaft into the trimmer body. Reattach the cutter head to the Power Adapter shaft. Insert the hex shaft into the chuck of a hand drill or power screwdriver and tighten securely. Make sure your power source is in line with the trimmer shaft. Install the proper pilot and adjust the stop collars to the desired lengths. Caution 1. Always wear proper eye protection during reloading. 2. Only use the trimmer adapter with electric hand drills or power screwdrivers operating between 140 and 1000 RPM. Do not use with a drill press. 3. The power source should be supported during use so that the trimmer shaft is not bearing the full weight. 4. Power use will cause more wear to the trimmer shaft and bearing than hand operation. Occasionally lubricate the trimmer shaft with light machine oil. 5. Read and follow all safety and operating instructions supplied with your electric drill and Lyman Universal Case Trimmer. 1Trimmer Body 7994433 2Cutter Head Assembly** 7822011 3Stop Collar, Fine 7994416 4Stop Collar, Coarse 7994417 5Set Screw 8-32 x 1/8” (2) 7994418 6Shaft Assembly 7994432 7Chuck Head Cap* 7994404 8Compression Spring*(2) 7994410 9Retaining Cam, RH* 7994409 10 Retaining Cam, LH* 799440811 Chuck Head Knob* 7994421 12 Chuck Head Base Only* 7994403 13Pan Head Screw#6-32*(3)7994428 14 Head Shaft Assembly 7994430 15 Hex Nut 9/16-18 7125559 *These items may be ordered from Lyman as a complete Chuck Head Assembly, 7994434. ** Replacements available in a two-pack, 7822203Key Part Description Part # Key Part Description Part # Universal Case Trimmer (continued) UNIVERSAL CASE TRIMMER