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12 pcs. black & gold jobber drills - 1/16
12 Pcs. Black & Gold Jobber Drills - 1/16
12 Pcs. Black & Gold Jobber Drills - 1/16
12 Pcs. Black & Gold Jobber Drills - 1/16
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12 Pcs. Black & Gold Drills - 1/16" Fractional High Speed Steel Jobber Drills - (135 Deg.) - "The Penetrator" - Heavy Duty. Manufactured from premium grade high speed steel, these "Penetrator" Jobber Drills have a heavy duty 135 split point for self-centering and reducing thrust. Gold and black surface treated for use in stainless steel and other hard metal drilling. Made in U.S.A.
Technical Specification:* SIZE : 1/16"
FACTORS THAT INFLUENCE DRILLING: When selecting or designing drills for today's materials and equipment, there are a number of factors that will influence your choices. These choices will determine the success or failure of the drill. Here are the three basic factors to consider:
In selecting a drill, one of the factors to consider is hole depth. The type of drill to apply will be determined by drill design. In sonsidering hole depth, four drill design features require examination. These include:
In Calculting feeds and speeds, consider the following:
* Material - Material will determine the surface feet or revolutions per minute (RPM's).
* Ductility of Material - Ductility of the material will determine the feed rate for ease of chip formation.
* BHN Briness Hardness - Hardness along with ductility will determine the base tool material for the drill.
Three elements of fixturing are important to successful drill performance. These include: rigidity, clearance for chips and passage for cutting fluids.
A)Rigidity - With regard to rigidity, ask the following questions: Does the part move in the fixture? Is the fixture mounted properly? Does the spindle have axial or radial play?
B)Clearance for Chips - Chip clearance is critical and the following needs to be assessed: Is there sufficient room for chip evacuation? Is the bushing the proper length? (Approximately 60% of drill lead) Is the bushing positioned on the part or is there clearance between the bushing and part to allow for chip evacuation?
C)Passages for Cutting Fluids - With regard to the use of cutting fluids, the following two inspections need to be made: Are there sufficient coolant lines? Are the coolant lines directed to the proper locations?
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All estimates are subject to additional charges depending on the area in which you are located. The carriers will assess an extra charge if delivery location is in a residential area and/or the services of a lift gate are required.
* Canada & Mexico: $3.00
* International: $4.75
Now Available for International Users
If you are the winner, click the button above to check out right now!
* Mailing Information for (Cashier Checks, Personal Checks & Money Orders)
