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CIRCULAR SAWS

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Stacked Dado Head. Wobble Blade. Sliding Tables. Great for ... Dado Heads. The same process is used, but the entire assembly must be mounted and sharpened. ... – PowerPoint PPT presentation

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Title: CIRCULAR SAWS


1
CIRCULAR SAWS
  • Table Saw
  • Jeremy Ledford

2
The Table Saw
  • The arbor is the shaft on which the blade is
    mounted.
  • Table saws may be left or right arbor.
  • Parts of the saw
  • Splitter
  • Handwheels
  • Miter gauge

14-4
3
Guards
  • Saw guards are NOT foolproof and their use will
    NOT completely eliminate the hazards of the table
    saw operation!!
  • Guard with and without splitters.

P 253
4
Saw Blades
  • Common Types of Blades
  • Rip, Crosscut, Rough Cut, Combination
  • Rip Blade teeth are filed straight across to
    form chisel shapes.
  • Crosscut Blade teeth are filed to a point.
  • The NUMBER OF TEETH determines the coarseness of
    the cut and the rate of feed.
  • More teeth need to be feed slowly. WHY?

5
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6
Carbide-Tipped
  • Strong tip is added to the blade.
  • Lasts longer than conventional blades.
  • We use a Combination Carbide-tipped blade.

7
Safety Rules
  • Check the blade
  • Use the guard for all operations whenever
    possible.
  • Set the blade above the wood 1/4? 1/8?
  • Tip of carbide blade
  • Stand to one side of the saw when cutting

8
Safety Rules
  • NEVER CUT STOCK FREE HAND!
  • Turn off the saw before making any adjustments.
  • Book states Use a push stick to move scrap
    cuttings away from the blade.
  • Turn off the saw, let it stop, then use a push
    stick to remove the pieces.

9
Safety Rules
  • When catching stock, only support it, do not push
    or pull the stock.
  • Clear the saw table and place waste cuttings in
    the scrap box.
  • Flying miter cut?

10
Ripping Stock
  • Ripping is cutting with the grain.
  • Have at least one straight edge to run along the
    fence.
  • NEVER reach over or around the saw to catch
    short pieces.
  • Use an auxiliary fence when ripping thin strips
    or veneers to prevent the stock from slipping
    under the fence.

11
Crosscutting
  • Crosscutting is cutting across the grain.
  • Move the fence out of the way.
  • Never use the miter gauge and the fence at the
    same time, unless you are using an auxiliary
    fence.

12
Crosscutting
  • To cut small pieces with a miter gauge, clamp the
    stock to a larger piece as shown.

13
Dado Head
  • The fence can be used with the miter gauge in
    this situation.
  • Stacked Dado Head
  • Wobble Blade.

14
Sliding Tables
  • Great for large piece, i.e. plywood sheets
  • Tru32 Cabinetmaking

15
Sharpening Blades
  • Certain equipment is needed to completely sharpen
    circular saw blades, however, they can be filed a
    number of times before they must be fully
    re-sharpened.
  • Page 234 in your text.

16
Sharpening Blades
  • Jointing rounding the blade so all the teeth
    are the same height.
  • Clamp an abrasive stone to the miter gauge.
  • Raise the blade till it touches.

14-47
17
Filing saw teeth
  • Mount the blade in a filing clamp.
  • File teeth
  • Rip blades straight across
  • Combination teeth 15 degrees

14-50
18
Setting Teeth
  • Blades must be set after a number of sharpenings.
  • Setting the blades keeps a saw kerf.

19
Gumming
  • Gumming is the process of grinding and shaping
    the saw gullets.

20
Dado Heads
  • The same process is used, but the entire assembly
    must be mounted and sharpened.

21
CIRCULAR SAWS
  • Radial Arm Saw

22
Radial Arm Saw
  • An advantage of the radial arm saw is that the
    board is held against the fence while the saw
    moves across the board.
  • This prevents kickbacks and reduces stock
    slippage.

23
Safety Rules
  • Support the ends of long boards.
  • Always return the saw to the rear of the table
    after making a cut.
  • Keep a margin of safety, 6in

24
Crosscutting
  • Control the feed rate
  • If the feed rate is not controlled properly, the
    saw will advance too rapidly and climb over the
    work.
  • Miters, bevels, and compound miters can be made
    on this machine.

25
Ripping
  • Ripping can also be performed on this saw.
  • Make sure to feed the stock into the blade.
  • Dados and grooves.

26
CIRCULAR SAWS
  • Portable Circular Saw

27
Parts of the Saw
28
Portable Circular Saw
  • Used extensively by carpenters in framing and
    construction.
  • Can be used in the lab for cutting rough sizes.
  • Size is determined by the diameter of the largest
    blade it will carry.

29
Safety Tips
  • Support the stock so the kerf will not close.
  • Clamp small pieces in a vise.
  • Adjust the depth of the cut according to the
    thickness of the stock, 1/8 deeper.
  • Do not lay the saw down until it stops moving.
  • DO NOT TRUST THE BLADE GUARD!
  • Dont create bad habits, co-worker story.

30
CIRCULAR SAWS
  • Miter Saw or Chop Saw

31
Miter Saw
  • Text Power Miter Box Saw
  • Good for cutting miters on trim and molding.

32
Compound Miter Saw Frame and Trim Saw
  • Saw pivots right or left up to 60 degrees
  • Supported on a pair of overhead shafts or guides
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