![]() A 0.008 depth of cut by 0.005 incremental feed is a good starting point. Nibble away at the corners of the square until you get used to what you are doing. Start the motor and hope for no surprises. Go no faster than the palest straw chip color on steel. Jump the belt to the top pulley step for minimum strokes per minute and snug the motor clamp. This ensures you don't start the motor with something solid in the tool path. Make a sketch to help you keep track of your moves.Ĭenter the hole under the tool and crank the tool through its stroke by hand-turning the step pulley. Monitor the clearance under the work so the tool doesn't run into a parallel as cutting progresses.Ĭheck the width of the tool, find the center of the hole and work out the X and Y of the hole corners with respect to the tool corners. You need positive support to keep the tool from pushing the work from the thrust of the cut. Adjust the knee so the tool just emerges from the bottom of the work. Position the tool at the bottom of its stroke. Set the stroke to the feature length plus 1/2" or so. Install the tool and dial in the lands before tightening the set-screw.Ĭheck the oil level and add worm or hypoid oil as needed. Indexing: Rotary table, super spacer, or use the detents in the clapper box. Note the machined reference edges in the E head’s lower front cover. Also on re-assembly, make sure the bevel on the ends of the pins mesh with the bevel in the ram’s retaining groove.ĭial in the ram stroke square with the table in X and Y. If you have to remove the clapperbox for any reason, be sure to back off the set screws (pc E80) far enough for the pins to fully retract. Incidentally the clapperbox is retained by bevel ended pins (pc E28) matching an angle groove in the ram pilot much like the compound swivel clamp on a South Bend lathe. Orient the clapperbox to solidly seat the ball detent and tighten the clamping screws. Once you've labored through grinding a few nicely made shaper tools they can be used for many other things. Naturally the tool has to clear the hole: you may be in for a LOT of grinding. Relieve the center between the corners leaving narrow lands at the corners. The tool should start out looking like a keyway tool and the width should be a bit less than the width of half the square. Make a double corner cutting tool whose side reliefs and clearances are 5 degrees. If you have to enlarge a round hole to square, make the hole about 2% larger than the finished square to reduce the amount of material you have to remove and to greatly simplify the finishing. If you have to cut a wider keyway, better start with 1/8" and, using a succession of wider tools, cut the width in symmetrical stages. ![]() Don't sneer at it for not being a 15 HP K&T.Ī 1/8 keyway tool in mild steel is about the limit for a BP E head in plunge cutting. When you buy a turret mill you buy versatility not cutting capacity. When using a Bridgeport E head, you have to limit not only the amount of material removed per stroke but the actual width of material the cutting edge engages. OTH you won’t break off the ram unless you do something Darwinian dumb. ![]() Here's an eBay auction that has several very informative photos:īP Type E heads are beautifully designed but while they are robust for their scale that doesn't put them in the same league as a Pratt & Whitney 12" vertical shaper or even a slotter attachment for a horizontal knee mill. It should fit snug but if it's too snug it may be hard to extract. You can make them easy enough from 5/8" dia x 6" round HSS cut to length but be careful of the as-ground shank dia. My BP E head has a cleverly designed little clapper box with adjustable spring tension, index detents, and a relief stop and has a 5/8" tool hole with a single set screw.įactory BP 5/8 slotter tools in a set are expensive: I've seen them on eBay for $400 and up for a partial set of seven tools and the link below offers a new full set for nearly $700. Books/Bridgeport Manuals/Bport Series 1 Install Operate and Maintain.pdfīrowse the auctions here. Careful reading will give you an idea of how to adjust the stroke, set the gibs on the ram, lubrication etc. Start here - I couldn't find the operator's manual for the Bridgeport E shaping and slotting head on line. ![]()
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