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" I think of John Prosock as a value added partner and I would recommend JPM to everyone except my competition." Kody, SKF

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Prosock Machine Shop Talk

April 14, 2009

Prosock Machine featured in Cutting Tool Engineering Magazine

Recently, Bill Kennedy of Cutting Tool Engineering magazine interviewed our shop Foreman, Claude Kennedy, for his monthly piece called, “Part Time.”  Bill asked Claude to describe a particularly challenging CNC machined part that would be an example of our long line of success stories.  Here’s the article:

Holding Firm

John Prosock Machine, Inc. is a Quakertown, Pa., job shop that handles prototype machining as well as production and assembly jobs. Founded in 1982, the shop today has 10 mills, 13 lathes, and about 30 employees. Typical production runs range from 100 to 2,000 pieces, and the shop serves a wide range of customers; “we pretty much do anything,” said plant manager Claude Farrington, “medical work, driveline components, heavy equipment, parts for remote-control cars, you name it.” The shop machines a variety of materials including common steels and aluminums as well as plastics, titanium, and other exotic alloys.

Describing the machining of a prototype aluminum trunion housing for a powerboat steering system, Farrington said the actual machining of the complex-appearing part was not too difficult; “it was a matter of trying to figure out how to hold it.”

The roughly 11 ½”-long, 5 ½”-wide housing was intended to be mounted on a boat’s transom and house an electronic linear actuator. It is part of a system designed to provide instant steering response when activated by controls at the helm, eliminating the slow reactions of a cable system.

Prosock Machine received a DXF file from its customer and loaded it into the shop’s Mastercam CAM package to program milling operations. Lathe work was programmed at the machine.

The housing was machined from a 12″ x 6″ x 3 ½” 6061T6 aluminum block. It was clamped with the long dimension standing vertical in a Kurt vise with aluminum soft jaws on an Excel 810 VMC. One end of the finished housing would feature a single 1.850″-dia., 3.850″-long boss, but to start, two identical bosses were machined side-by-side. “We machined two so that when we flipped it over we could use them to align the part in the vise. Later we cut the one off that we didn’t need,” Farrington said.

The twin bosses were machined with a 1 ½”-dia. HSS endmill, run at 3,000 rpm and a 30 ipm feed rate, taking a 4″ length of cut. Farrington described the toolpath as “a figure 8 around the bosses,” stepping down 0.200″ on each pass.

Then the housing was flipped over in the vise and one of the bosses was located against a stop. On the other end of the finished housing would be two bosses that were not identical, being of different diameters and offset from each other by 70˚. One boss, in line with a boss machined earlier, was 2.100″ in diameter. The other boss was 1.514″-dia. Because this second set of bosses were closer together than the first pair, smaller endmills were used to machine them. The bosses were roughed with a 7/8″-dia. HSS hogmill and finished with a ¾”-dia. HSS endmill, both run at 1,200 rpm and 10 ipm with a 4″ loc. The two bosses were 1.360″ long, but one was set back (x “?) deeper in the part than the other.

Water-soluble coolant was applied throughout the machining process. Farrington described the HSS tools the shop employs as “generic,” and said all the solid-carbide tools it uses are from Mill Monster, while inserted milling and turning tools are from Kennametal.

When milling of the second set of bosses was complete, the smaller diameter one was drilled and reamed. A 1 1/16″-dia. HSS drill, run at 600 rpm and 4 ipm feed and pecking each 0.200″, drilled to a depth of 7.7″. As the tool pecked in and out of the workpiece, flood coolant from the spindle cleared the chips from the hole. A 1.103″-dia. reamer then finished the hole to a tolerance of +/- 0.0004″. At this point, the housing was removed from the mill and the extra boss created in the first operation was cut off with a band saw, leaving a short stub to be faced off later.

Next, the part was clamped horizontally in the vise and a 3″-dia. shell mill, run at 2,500 rpm and 20 ipm, face milled the housing to height of the next feature, a 3.5″-wide, 2.7″-long, 0.72″-deep pocket that would hold the actuator electronics. A ½”-dia. carbide endmill run at 3,500 rpm and 25 ipm, roughed out the pocket, leaving 0.050″ extra stock on the sides and 0.010″ on the floor. Then a ¼”-dia. carbide endmill finished the side profiles and bottom. A very small pocket in the bottom of the larger feature required the application of a 1/32″-dia. carbide endmill. Outside each corner of the pocket a hole was drilled 0.433″ deep with a 0.114″-dia.(?) drill, and tapped with an M3.5 x 0.6 tap.

The next operation involved milling the back of the housing. The part was flipped over in the vise, the 3″-dia. shell mill faced away excess material, and a ½”-dia. carbide endmill roughed and finished the details. The sharp edges of a lug created in the operation then were rounded with a radius mill.

Next, the housing was moved to a Eurotech turning center for turning, facing, and boring. With the 2.100″-dia. boss clamped in the chuck, the (now) single 1.850″-dia. boss on the other end of the part was turned down to a 1.765″ diameter for a length of 1.653″, using a DNMG 431 insert run at 700 rpm and a feed rate of 0.008 ipr. The same tool then faced off the remaining stub of the extra boss removed earlier. Farrington said the eccentric shape of the part posed no problem in the lathe; “It was a pretty good size diameter to hold on to, and we didn’t spin it at very high rpm.” A NTF2R threading insert then cut an M45 x 1.5 thread at the end of the boss.

Next, a 1-5/16″-dia. drill, employed at 400 rpm and 0.010 ipr with a 0.250″ peck cycle, drilled the boss out to a depth of 9.665″. A 1″-dia. KMT boring bar run at 500 rpm and 0.007 ipr finished the bore to a diameter of 1.37″, +/- 0.002″.

The part then was turned end for end in the lathe and chucked on the 1.850″-dia. boss, behind the thread. A 13/16″-dia. drill made a 2 ¼”-deep hole in the 2.100″-dia. boss at 500 rpm and 0.005 ipr, employing a 0.250″ peck. Then a 5/8″-dia. boring bar created a chamfer and a counterbore in the front end of the hole, and behind that cut a bearing diameter of 1.0004″, +/- 0.0004″.

For the final operation, the housing was clamped horizontally in a Haas indexer mounted on the table of the Excel VMC, again held on the 1.850″-dia. boss. A ½”-dia. carbide endmill, run at 2,000 rpm and 18 ipm, milled a series of lengthwise flats, positioned via the indexer at 10˚ intervals. Then the same endmill circular-interpolated two 0.775″-dia., 0.354″-deep counterbores in the end of the 2.100″-dia. boss. After machining, the housing received a 0.005″ – 0.010″ thick blue anodized coating.

Farrington said that total machining time for each part was roughly 1½ hours. He termed this job a typical small volume (“The customer wanted three, we made five”) prototype job, involving ongoing consultation with the customer’s engineers as the design evolved during the prototyping process.

For more information about John Prosock Machine, Inc., call (215) 804-0321 or visit www.jprosock.com

March 10, 2009

CNC Machines

MULTI-SHOP ONLINE MACHINE TOOL AND NEW PRODUCTIVITY OVERSTOCK TOOLING AUCTION

WWW.MACHINESUSED.COM ONLINE MACHINE TOOL AUCTION
Bidding Opens: Tuesday, March 10, 2009
Lots Close Beginning at 11 AM CDT on Tuesday, March 24, 2009
CLICK HERE TO GO TO THE AUCTION SITE AT http://auctions.machinesused.com

OR Click any photo below go to to the Auction

1996 CHARMILLES ROBOFORM 4000 CNC EDM SINKER

400-220 VOLT TRANSFORMERS

NEW KENNAMETAL INSERTS

ASSORTED 40 TAPER TOOL HOLDERS

1991 HURCO KM-3P 3-AXIS CNC VERTICAL MILL

ASSORTED BT TAPER TOOL HOLDERS

KALTENBACH COLD SAW
NEW ROVI CHUCK JAWS

1989 KIWA 510-COLT CNC VERTICAL MACH CENTER

ASSORTED BESLEY TAPS

SMW RT-5C PROGRAM-MABLE ROTARY TABLE WITH CONTROLER

ATAM-1100 TOOL AUCTION ANALIZER

Machine Tools and Accessories Surplus to Several Shops, Including: Kia Colt CNC VMC, Hurco CNC Knee Mill, Charmilles 4000 CNC Sinker, Kaltenbach Cold Saw, 440-220 Volt Transformers, NEW TOOLING AND ACCESSORIES FROM PRODUCTIVITY OVERSTOCK, INCLUDING: Besley Taps, Cat 40 Tool Holders, BT-30 Tool Holders, End Mills, Carbide Inserts, Drills, Kennametal Holders, Komet Insert Drills, Tool Vibration Analyzer, Insert milling Cutters, End Mills, AND MORE!!

Click here to go to Our Auction Site for complete listing and Details.

MACHINESUSED.COM ALSO HAS A GREAT SELECTION OF USED EQUIPMENT IN INVENTORY

2007 DOOSAN DAEWOO PUMA 2000Y CNC TURNING CENTER
2007 HE&M H90A-4 AUTOMATIC HORIZONTAL BAND SAW

2004 HAAS EC-400 CNC HORIZONTAL MACHINING CENTER

2000 FANUC OiA-S/AWF CNC WIRE EDM
2003 MAKINO S56 CNC VERTICAL MACHINING CENTER
2000 PRECIX 9100 INDUSTRIAL SERIES CNC ROUTER

Click here to check out our used inventory for sale at Machinesused.com

WE BUY / SELL / APPRAISE / AUCTION / LIQUIDATE USED MACHINE TOOLS AND MANUFACTURING EQUIPMENT

CLICK HERE TO CONTACT US FOR YOUR SURPLUS USED EQUIPMENT!


Contact John Lawton, John Schulte, Sharon Iversen, or Dawn Olsen at (763) 745-1166 for details.


Machinesused.com (Div. of Productivity Inc.) | 15150 25th Ave. North, Suite 100 | Plymouth MN 55447 | www.machinesused.com

March 4, 2009

Open house for Machine Shop owners

For Machine Shops that are looking for answers, check this out.

Open House March 18th 9am to 4pmBottom Header or register by calling (866) 277-8778 ext. 219 or email events@cimquest-inc.com

Please join us for an Open House featuring CAD/CAM and Prototyping Solutions. You can come and stay as long as you like. There will be Technical Professionals available all day long for product demonstrations. Appointments are not necessary for this event, however registration is required.

• High-end Rapid Prototyping Technology for under 15K
• Network with other industry professionals
• Stump the Applications Engineer – Demonstrations and Q&A’s
See first-hand new products
? uPrint 3D Printer by Dimension
? Robotmaster for robot programming
? Fortus Direct Digital Mfg. machine for your prototyping needs
? Simulation, Technical Publications and Data Management Solutions
? Mastercam running INSIDE SolidWorks

View the Specifications

See the Applications

uPrint

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or call (866) 277-8778 ext. 219

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    testing.
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Click here to request a sample part

Open House 9am to 4pm Registration Required
Logos
Dimensions

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or call (866) 277-8778 ext. 219

Dimension Printers

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Fortus Product Lines

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or call (866) 277-8778 ext. 219

Fortus Products

Fortus 360mc – The Fit, Form and Function System
Fortus 400mc - The Flexible System
Fortus 900mc – The Production System
Demonstrations are also available for:
SolidWorks RobotMasters MasterCam
Cimquest Inc.
1545 Route 206 South – 2nd Floor
Bedminster, NJ 07921
(866) 277-8778 ext. 219
events@cimquest-inc.com
http://tk1.publicaster.com/DC/ctr.aspx?6C6164=35373238393633&736272=31281&747970=6874&66=30 uPrint http://tk1.publicaster.com/DC/ctr.aspx?6C6164=35373238393634&736272=31281&747970=6874&66=30 Stratasys http://tk1.publicaster.com/DC/ctr.aspx?6C6164=35373238393630&736272=31281&747970=6874&66=30 SolidWorks http://tk1.publicaster.com/DC/ctr.aspx?6C6164=35373238393632&736272=31281&747970=6874&66=30 Mastercam http://tk1.publicaster.com/DC/ctr.aspx?6C6164=35373238393631&736272=31281&747970=6874&66=30 RobotMaster http://tk1.publicaster.com/DC/ctr.aspx?6C6164=35373238393638&736272=31281&747970=6874&66=30 Dimension

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