2261-inserted tip carbide boring tools
Contents
1. hundreds of times more than a Sherline lathe Positive rake tools have to be sharpened at the time of manufacture which adds to their cost but also adds to their performance on a Sherline machine You can t use any insert in these holders unless it has a positive cutting edge A negative rake tool holder designed especially for Sherline lathes P N 7610 is now available It is extremely rigid and allows the use of a 55 negative rake carbide tip which because of the design of the holder cuts like a positive rake cutter The tool offers a cost advantage as well o gt OUT a EOGI EDGE J Heqatwd Aiaka Tip Polha Fake Tip GUTTING FIGURE I Negative and positive rake carbide cutting tips Negative rake tips can be held upside down giving four cutting edges Positive rake tips cut from one side only but cut better These boring tools have positive rake Another choice I made was the 015 4mm radius on the tip A large tool radius can give good finishes on a full size machine but it can cause havoc on small diameter parts or miniature machines Large radius tools create high tool loads because of their large cutting surface A radius smaller than 015 will chip too easily The difference between the 80 and 55 tools is that the 80 tool is a little stronger at the tip but the 55 tool can get into corners If you plan to only purchase one buy the 55 The 80 tool is a good choice to rough cut wit2. 608 80 carbide insert CPMT 21 21 2A VC29 76230 Torx screw 76770 T7 Torx driver P N 2261 Pg 20f 2
3. feel is safe and appropriate for Sherline tools If you have a longer bar we do not recommend you extend the tool more than a few inches from the holder to limit tool flex BORING TIP When boring inside ahole chip buildup can be a problem Stop and clear chips often using a probe or small brush Do not try to remove them when the part is turning Some machinists find that working with the tool rotated 180 so the chips come out the bottom side works better for helping them to clear the part by themselves The disadvantage of this method is that the flat forthe hold down screws is no longer useable and the toolis held less securely Also because the tool body is not hardened take care not to over tighten the screws when tightening against the round part of the tool Ifthe metal on the round shaft is upset dented by the screw head it may become difficult to remove the tool from the round hole in the tool post Speeds and feed rates for boring Asis true for all carbide tools these boring tools favor higher cutting speeds than high speed steel tools Cutting should be done at the fastest speed you can use without getting tool chatter We recommend a feed rate of about 002 per revolution 05 mm rev Joe Martin President and Owner Sherline Products Inc PARTS LISTING G RSIDE BORING TOOL HOLDERS P N DESCRIPTION 22591 80 boring tool holder body 22601 55 boring tool holder body 7605 55 carbide insert DPMT 21 51 2A VC29 7
4. h To get maximum life out of these tools be sure to increase the feed as you increase the RPM The chip should have a tight curl to it and break off into short lengths These chips can be very HOT Remember your hands are closer to the cutting edge when using miniature machine tools so use caution Another plus for insert tools is their ability to cut hard or abrasive materials Don t plan on machining down the SHERLINEPRODUCTSINC 3235 Executive Ridge Vista California 92081 8527 FAX 760 727 7857 Toll Free O rder Line 800 541 0735 International Local Technical Assistance 760 727 5857 Internet www sherline com 4 6 10 shanks on end mills with them but you can cut through a work hardened surface on stainless steel with ease These tools can simplify many machining operations but will never solve problems caused by poor machining practices As with all machining operations WEAR EYE PROTECTION 3 8 Round Boring Tools Sherline offers boring tools with two different tip shapes The P N 2259 boring tool accepts an 80 carbide insert and requires a minimum hole size of 1 2 P N 2260 accepts a 55 carbide insert and requires a minimum hole size of 3 4 In addition to fitting into asmaller hole the 80 holder offers a little more strength while the 55 holder will cut into a sharper corner The total length of the tool is 3 1 4 and with full insertion in the tool post 2 hold down screws engaged on the flat y
5. he success of insert tools in recent years Steel and carbide have slightly different expansion rates which can cause premature failure of the carbide tip It is surprising that a small screw will hold these inserts tight enough to accurately cut metal but they do We run 20 horsepower computer controlled lathes at Sherline that can remove metal at a rate of 2 pounds 1 kilogram a minute with these tools and have few failures The reasons I believe insert tools should have a place in your shop is they are ready to use they hold their cutting edge when cutting exotic metals or abrasive materials and can speed up the cutting process Normal cutting speed rules don t have to be considered to the same extent as when using high speed steel Stainless steel can be cut at triple the rate over high speed steel with these tools This puts you in a better horsepower range on the Sherline motor Another interesting fact is you can get a better finish on some steels such as cold rolled by turning up the RPM Insert tools don t need cutting oils to work well but I still use a few drops now and then This can be an important fact when working on your kitchen table I experimented with various tools before making a choice I wanted a cutting tool that had a positive rake I don t believe the tools we manufacture are rigid enough for negative rake tools which cost less and are far more popular These tools are designed for machines that weigh
6. i SARTY GLASSES nN FORESIGHT IS BETTER THAN NO SIGHT READ INSTRUCTIONS BEFORE OPERATING Torx wrench P N 2259 80 2260 55 2261 pair 22Vai2260 NE PRODUCTS INCORPORATED 1974 INSERTED TIP GQARBIDE BORING TOOLS PIN2259 2260 2261 QUTION HOT CHIPS The chips produced by carbide insert tools can be very HOM Remember your hands are closer to the cutting edge when using miniature machine tools so use caution WARNING Carbide cutting tips may chip or fragmentin use Always use machine guards protective clothing and safety glasses to prevent burns or other injury to body or eyes from flying particles or chips Grinding produces hazardous dust To avoid adverse health effects use adequate ventilation and read Material Safety Data Sheet for appli cable carbide grade first For Data Sheet write to Valenite 31100 Stephenson Hwy Madison Heights MI 48071 Using Garbide Inserted Tools I would first like to emphasize that I believe the prime method of cutting metals on a miniature metal cutting lathe shouldbe high speed steel It s inexpensive easy to sharpen and can be shaped to make form tools Insert tooling is expensive can t be resharpened or shaped but it can be a lifesaver The obvious difference between carbide tools and inserted carbide tools is the tip is held on with a screw rather than brazed on to a piece of steel This fact has a lot to do with t
7. ou can bore a hole about 2 deep Further extension is possible but not recommended due to the potential for tool flex Each tool comes with one carbide insert ahold down screw of the appropriate length and a T7 Torx key to tighten the hold down screw The holders can be held in the round hole of the P N 7600 tool post for use on a Sherline lathe Using a boring bar The use of a boring tool requires the existence of a drilled or cored hole or it may be used to enlarge the bore of a tube The work must be mounted in a chuck or on a faceplate and the boring tool set as shown in Figure 2 below Note the clearance behind the cutting point aa FIGURE 2 A conventional ground steel tool is shown in this illustration but a carbide tool is used in the same manner for boring The boring bar is designed with a flat on the top surface The two hold down screws of the P N 7600 tool holder are tightened on this flat to both lock the tool in position and keep it from rotating Extend the tip of the tool only as far as necessary to bore the depth you need The farther the tool extends from the holder the more it can flex This can cause you to bore a taper give a poor finish or in extreme cases cause the insert to dig in or break The further the tool is extended the lighter the cut should be Sherline used to offer a longer boring bar made by another manufacturer but we now make this one ourselves and have limited the length to what we
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