Piece Center Punch
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Astro Pneumatic 1600 16-Piece Punch and Chisel Set List Price: $32.08 Sale Price: $14.99  |
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Chrome vanadium steel Heat treated Punches: (5) Taper punches, (5) Pin punches, (2) Center punches Chisels:(3) Clod chisels, (1) Chisel gauge and (1) Plastic storage tray This 16 piece punch and chisel set includes the following sizes: Taper Punch: 3/32" x 5-1/4", 1/8" x 5-3/4", 5/32" x 6", 3/16" x 6-1/4", 1/4" x 6-3/4"; Cold Chisels: 3/8" x 5-1/2", 1/2" x 6", 5/8" x 6-1/2"; Pin Punch: 3/32" x 4-1/4", 1/8" x 4-3/4", 5/32" x 5", 3/16" x 5-1/4", 1/4" x 5-3/4"; Center Punch: 1/8" x 5", 3/16" x 6" . |
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Stanley 16-299 12 Piece Punch & Chisel Kit List Price: $32.99 Sale Price: $22.99 |
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Stanley 16-299 12 Piece Punch & Chisel Kit Stanley is proud of its reputation for excellence. They are dedicated to continually testing, designing and improving their products to ensure quality and maximum function... |
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Neiko Interchangeable 10-Piece Hollow Punch Set with Adjustable Center Pin List Price: $40.00 Sale Price: $16.57 |
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High quality hollow punches set, for cutting holes in thin metal, wood, leather, plastic and other materials. Satisfaction Guaranteed. |
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Snap-on Industrial Brand JH Williams PS-4 4-Piece Center Punch Set List Price: $44.33 Sale Price: $22.70 |
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Fuller Tool 620-0136 4-Piece Nail Set and Center Punch Combination with 1/32-Inch, 2/32-Inch, 3/32-Inch Nail Sets and 1/8-Inch Center Punch Sale Price: $9.86 |
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SE Punch Set, 8Pc 4 Brass 4 Chrome List Price: $10.95 Sale Price: $9.90 |
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*8 handy short pin punches in compact storage canister*4-each solid brass and chrome steel punches: 1/16 in., 3/32 in., 1/8 in. and 5/32 in.*Each punch machined from single piece, 3-1/4 in. LOA, 1 in. pin length; diamond-pattern grip*Two-piece ABS canister protects and keeps punches organized; fits neatly in toolbox drawer |
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Wiha 12491 4, 5 and 6mm Tapered Center Punches, Metric, 3-Piece Set List Price: $26.46 Sale Price: $17.65 |
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Metric Center Punch 3 Piece Set 4,5 and 6mm |
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SpringTools WWA996 4 Piece Woodworking Set with Center Punch, Nail Set, Combo Nail Set, Self Centering Brad Setter, Self Centering Center Punch List Price: $39.95 Sale Price: $39.95 |
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Starrett S117PC 5 Piece 1/16-Inch to 5/32-Inch Center Punch Assortment in Plastic Case List Price: $33.50 Sale Price: $24.33 |
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Made of specially selected steel, hardened and properly tempered. Well proportioned, nicely finished and have a knurled finger grip. Points are ground at the proper angle to give maximum service, and the tips are accurately centered. |
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SE 18 pc. Brass and Carbon Steel Drive Pin Punch Set List Price: $24.95 Sale Price: $18.50 |
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Must have tool set for gunsmiths, machinists, jewelers, mechanics and wood workers. |
Moment of Inertia help please?
a flat, uniform disc has mass M and radius R. a circular hole of radius R/4 centered R/2 from the disc's center is punched into the disc.
a) what is the moment of inertia of the disc with the hole (so the entire disc) about an axis through the ORIGINAL CENTER OF THE DISK AND IS PERPENDICULAR TO THE PLANE OF THE DISC?
(it helps to find the moment of inertia of the piece punched from the disc somehow)
b) what is the moment of inertia of the disk with the hole (so the entire disc) about an axis THROUGH THE CENTER OF THE HOLE AND PERPENDICULAR TO THE PLANE OF THE DISC?
(the parallel-axis theroem is Iparallel = Icenter of mass + Md^2 where I is the moment of inertia. (so Iparallel is the moment of inertia through the parallel axis and Icenter of mass is the moment of inertia through the center of mass))
the answers i got are:
a) (247/512)MR^2
b) (385/512)MR^2
for a)
i got, 247/512 MR^2, so you probably got them right.
M disk = M/16
I hole about the hole's center = (M/16)(R/4)^2/2 = 1/512 MR^2
I hole about the disk's center = 1/512 MR^2 + (M/16)(R/2)^2 = (1/512 + 1/64) MR^2 = 9/512 MR^2
I disk without hole about the disk's center = 1/2 MR^2
I disk with hole about the disk's center = (1/2 - 9/512) MR^2 = 247/512 MR^2
