TO INFORM YOU - Milwaukee Electric Tool

TO INFORM YOU
PRODUCT
SUPPORT
BULLETIN # 433
TO:
DATE: April 2005
AUTHORIZED portable electric tool SERVICE STATIONS
factory SERVICE / SALES SUPPORT BRANCH
SALES COMPANIES
TOOL(S) \ PRODUCT(S) AFFECTED: 6370-20 13.0 Amp 8” Metal Cutting Saw
SUBJECT: 31-44-0201 Handle Kit with Overload Circuit Breaker
Circuit Breaker
Overload Protector
List Price $22.25 USD
Circuit Breaker Overload Protection is being added
to the 6370-20 13.0 Amp 8” Metal Cutting Saw to
reduce the chance of motor – armature & field burn-up due to operator overload.
31-44-0201 Handle Kit with Overload Circuit
Breaker contains:
right handle half
left handle half
wiring harness assembly
22-36-0160 Overload Circuit Breaker Protector
Kit updates a Series A serial number 6370-20
13.0 Amp 8” Metal Cutting Saw to Series B (see
Service Parts List Bulletin 54-40-1626).
22-36-0160 Overload Circuit Breaker Protector is designed to trip when the tool is being stressed beyond its
design capacity.
Capacity
Steel Studs, Steel
10 gauge, up to 2-9/16”
Decking, Roofing Panels in depth
Steel Plate
1/4" thick
Angle Iron
2-1/2” X 2-1/2” X 1/4”
Please see reverse side for tips and techniques to optimize the cutting performance of the circular saw and blade
life.
Circuit Breaker is ‘open’ when the button is out; if the tool doesn't run with the breaker in, a
continuity check across the terminals of the breaker would be appropriate (button in).
NO Continuity across the two circuit breaker terminals with the button in the breaker would be faulty, or damaged
internally and need to be replaced.
Continuity across the two circuit breaker terminals with the button out the breaker would be faulty, or damaged
internally and need to be replaced.
Is this an add-on to any saw coming in? Yes, if the motor is burnt up. Please note a burn-up of the armature and field are
most likely due to overload and it is critical that the customer is aware of the saws limitations - please send the saw back with
a copy of the OPTIMIZING CUTTING PERFORMANCE page.
Please be aware that if the user overrides the circuit breaker, either by holding-it-in, taped-it-on or not letting the motor rest
and cool, as the circuit breaker resets itself in about 2-3 minutes while the motor needs 60 minutes of not being run or
6 minutes of running at no-load to properly cool the motor and blade; they will still be able to burn-up a motor.
This bulletin is for informational purposes. PLEASE NOTE ON SERVICE PARTS LIST: 54-40-1625
MILWAUKEE ELECTRIC TOOL CORPORATION
13135 WEST LISBON ROAD • BROOKFIELD, WISCONSIN 53005 USA
(262) 781-3600
OPTIMIZING CUTTING PERFORMANCE
Tips and Techniques to OPTIMIZE the cutting performance and blade life of the
6370-20 8” Metal Cutting Circular Saw
Metal Cutting Saw Blades 48-40-4515 (42T) and 48-40-4520 (50T)
Do’s
Feed the saw at a constant rate during the cut.
Observe proper depth setting; blade should extend no more than ¼” below the material being cut.
Apply enough pressure to avoid sparks. Sparks creates heat and shortens blade life. In some conditions this means an
increase to the feed rate and other conditions the need to decrease the feed rate to reduce and eliminate sparks.
Allow tool to come to full speed before applying blade to work surface. Start lightly, then apply enough pressure to avoid
sparks. (see Feed Rate / Cutting Time chart ).
Keep the cut straight. If following a cut line and you veer off, getting back on line may cause side loading of the blade
and break the teeth. Use an edge guide whenever possible.
Clamp material to be cut to avoid vibration. Vibration and/or too little pressure allows the material to chatter ever so
slightly, not even apparent to the naked eye. This results in sparking and heat build up which shortens blade life.
Periodically allow the tool to run free of the working surface to cool the carbide tips of the blade and to cool the motor of
the tool.
This is particularly important when making long cuts and cuts through thicker material;
i.e. anything over the saws recommended capacity of 1/4”.
Don’ts
⌧ Don’t cut Hardened materials (rebar, sign posts). These blades were not designed for this type of material.
⌧ Don’t jam the blade into the work surface, ease into the piece then apply sufficient pressure to avoid vibration and
sparks. (see Feed Rate / Cutting Time chart).
⌧ Don’t stack or bundle. The gaps between layers allow for more opportunities to chip the carbide or cermet teeth and
create vibrations which can lead to dulling. The life of the carbide is severely affected by these interrupted cuts (stops
and starts).
⌧ Don’t apply side pressure on the blade or teeth as this will causing chipping of the teeth.
⌧ Don’t cut too slowly. If appropriate speed and feed pressure are not maintained, the carbide will wear out quickly.
⌧ Don’t cut too fast. Pushing too hard and too fast may cause the carbide tooth tips to break and overload the motor.
⌧ Pushing too hard and too fast especially on interrupted cuts such as grating where continual stops and starts are
encountered may cause the carbide tooth tips to break.
Please see Operator’s Manual OPERATION & APPLICATIONS sections for further details of optimizing the
cutting performance of the 6370-20 Metal Cutting Circular Saw and Metal Cutting Saw Blades.
Feed Rate / Cutting Time
Material Thickness
Maximum Cutting Time /
Period (Seconds)
Maximum Length Cut During
Cutting Time (Inches)
Feed Rate (seconds/inch)
1/4”
45 - 60
20”
2-3
3/8”
30 - 45
15”
2–3
1/2”
18 - 36
9”
2–4
5/8”
18 – 30
6”
3–5
3/4”
20 – 25
5”
4-5
Tool and Blade Cool
Down Per Cutting
Period
60 minutes rest or
6 minutes running
under no load at
full no load speed