Bridgeport Mill

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General

Owner/Loaner: Bill Piepmeyer Serial Number: J-122018 Make/Model: Bridgeport Mill Arrival Date: 2016 Usability: works Contact: person to contact Where: metal shop

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Generally used to machine flat surfaces, this mill can produce irregular surfaces, drill, bore, cut gears, and cut slots. This milling machine is a vertical spindle machine with a swiveling head.

Safety

• Do not make contact with the revolving cutter.
• Place a wooden pad or suitable cover over the table surface to protect it from possible damage.
• Use the buddy system when moving heavy attachments.
• Do not attempt to tighten arbor nuts using machine power.
• When installing or removing milling cutters, always hold them with a rag to prevent cutting your hands.
• While setting up work, install the cutter last to avoid being cut.
• Never adjust the work piece or work mounting devices when the machine is operating
• Chips should be removed from the work piece with an appropriate rake and a brush.
• Shut the machine off before making any adjustments or measurements.
• When using cutting oil, prevent splashing by using appropriate splash guards. Cutting oil on the floor can cause a slippery condition that could result in operator injury.

Fixture

Cutting Speed To know what speed to run the mill you must know:

• The type of material you are cutting (steel, aluminum, brass, etc)
• The type of cutter you are using (HSS (High Speed Steel) or Carbide)
• The diameter of the cutter

SFM (Surface Feet per Minute)

Material	HSS	Carbide
Aluminum	600	800
Brass	175	175
Delrin	400	800
Polycarb	300	500
Stainless Steel	80	300
Steel	70	350

Suggested RPM SFPM X 3.82 / Tool Diameter

Example: You are cutting Aluminum with a 3/8" HSS end cutter

600 x 3.82 / 0.375 = 6112 or Set the mill to 6000 RPMS