Silver Deming

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i need to cut a perfect 1" circle in a piece of 1/4 aluminum.what is the best tool to use?

Well, first off, good luck trying to pull a Greenlee punch through .250 thick aluminum (just kidding, don't try) you need a drill press and access to a good quality 1" Silver & Deming HSS drill bit. Work your way up to the 1" bit by drilling a pilot hole and then drill the 1" hole.

Oh, by the way, if you want it to be "perfect", drill it undersize (15/16") and then use a 1" reamer, that will get you within +/- .0001". Looks like most of these other answers come from woodworkers.

Discover Silver Deming On eBay Below:

57 64 Cobalt 1 2 Shank Silver  Deming Drill 135Notched Point USA 303C 57 64
57 64 Cobalt 1 2 Shank Silver Deming Drill 135Notched Point USA 303C 57 64
$63.53
91476 High Speed Steel Silver  Deming Drills Drill Point Angle 118 Degress
91476 High Speed Steel Silver Deming Drills Drill Point Angle 118 Degress
$86.97
39 64 Cobalt 1 2 Shank Silver  Deming Drill 135Notched Point USA 303C 39 64
39 64 Cobalt 1 2 Shank Silver Deming Drill 135Notched Point USA 303C 39 64
$36.97
37 64 Cobalt 1 2 Shank Silver  Deming Drill 135Notched Point USA 303C 37 64
37 64 Cobalt 1 2 Shank Silver Deming Drill 135Notched Point USA 303C 37 64
$34.78
35 64 Cobalt 1 2 Shank Silver  Deming Drill 135Notched Point USA 303C 35 64
35 64 Cobalt 1 2 Shank Silver Deming Drill 135Notched Point USA 303C 35 64
$32.49
Precision Dormer 091476 1 3 16 x 1 2 Shank HSS Silver  Deming Drill
Precision Dormer 091476 1 3 16 x 1 2 Shank HSS Silver Deming Drill
$85.93
TTC 39 64 x 1 2 Shank USA Made HSS 3 Flat Shank Silver  Deming Drill Pack 2
TTC 39 64 x 1 2 Shank USA Made HSS 3 Flat Shank Silver Deming Drill Pack 2
$50.42
TTC 55 64 x 1 2 Shank Milled HSS Silver  Deming Drill Pack of 2
TTC 55 64 x 1 2 Shank Milled HSS Silver Deming Drill Pack of 2
$44.34
TTC 45 64 x 1 2 Shank Ground HSS Silver  Deming Drill Pack of 2
TTC 45 64 x 1 2 Shank Ground HSS Silver Deming Drill Pack of 2
$45.02
Silver  Deming 1 HSS Reduced Shank Drill Bit
Silver Deming 1 HSS Reduced Shank Drill Bit
$50.00
NEW 29 64 USA Made Silver  Deming Drills with 3 8 Shank
NEW 29 64 USA Made Silver Deming Drills with 3 8 Shank
$3.63
NEW 13 32 USA Made Silver  Deming Drills with 3 8 Shank
NEW 13 32 USA Made Silver Deming Drills with 3 8 Shank
$3.04
Silver Deming Reduced Shank Drill 1 2 HSS Oxide 118 3 x 6 301
Silver Deming Reduced Shank Drill 1 2 HSS Oxide 118 3 x 6 301
$26.46
Silver  Deming Reduced Drills 1 2 Shank HSS 23 32 Dia 118 3 Pcs
Silver Deming Reduced Drills 1 2 Shank HSS 23 32 Dia 118 3 Pcs
$43.66
Silver Deming Reduced Shank 45 32 HSS Oxide 1 2 x 6 118 55445 6467E1356
Silver Deming Reduced Shank 45 32 HSS Oxide 1 2 x 6 118 55445 6467E1356
$22.16
DRILL AMERICA Silver Deming Drill 1 5 16 HSS 118 USA
DRILL AMERICA Silver Deming Drill 1 5 16 HSS 118 USA
$40.78
Silver Deming Reduced Shank 29 32 HSS Oxide 1 2 x 6 118 55458
Silver Deming Reduced Shank 29 32 HSS Oxide 1 2 x 6 118 55458
$28.36
Silver Deming Reduced Shank Drill 61 64 HSS Oxide 1 2 x 3 x 6 118
Silver Deming Reduced Shank Drill 61 64 HSS Oxide 1 2 x 3 x 6 118
$23.93
GREENFIELD Silver Deming Reduced Shank Drill 1 7 16 x 1 2 53492
GREENFIELD Silver Deming Reduced Shank Drill 1 7 16 x 1 2 53492
$119.07
Silver Deming Reduced Shank Drill 1 3 8 x 1 2 HSS 118
Silver Deming Reduced Shank Drill 1 3 8 x 1 2 HSS 118
$50.27
Silver Deming Reduced Shank Drill 61 64 HSS Oxide 118 55461
Silver Deming Reduced Shank Drill 61 64 HSS Oxide 118 55461
$32.80
Silver Deming Drill 51 64 HSS Oxide 1 2 x 6 118 55451
Silver Deming Drill 51 64 HSS Oxide 1 2 x 6 118 55451
$24.82
Silver Deming Reduced Shank Drill 1 5 8 HSS Oxide 118 3 4 Shank
Silver Deming Reduced Shank Drill 1 5 8 HSS Oxide 118 3 4 Shank
$132.97
NEW Irwin 31 64 Silver  Deming Drills with 3 8 Shank
NEW Irwin 31 64 Silver Deming Drills with 3 8 Shank
$4.50
Silver Deming Reduced Shank Drill 13 16 HSS Oxide 1 2 x 6 118D 5655E1588
Silver Deming Reduced Shank Drill 13 16 HSS Oxide 1 2 x 6 118D 5655E1588
$18.61
PRECISION Silver Deming Drill 1 2 118Deg HSS Oxide 1 2 x 3 x 6 4936E1712
PRECISION Silver Deming Drill 1 2 118Deg HSS Oxide 1 2 x 3 x 6 4936E1712
$21.28
Silver  Deming Reduced Shank Drills 3 8 Shank HSS 27 64 Dia 6 Pcs
Silver Deming Reduced Shank Drills 3 8 Shank HSS 27 64 Dia 6 Pcs
$31.91
TMX Metric Silver Deming Drill 290mm 118 1 2 x 3 x 6 5 167 290
TMX Metric Silver Deming Drill 290mm 118 1 2 x 3 x 6 5 167 290
$59.54
1 9 32 Black  Gold 1 2Shank SilverDeming Drill 118 Split Point YG1 D1191118
1 9 32 Black Gold 1 2Shank SilverDeming Drill 118 Split Point YG1 D1191118
$84.32
1 5 16 Black  Gold 1 2Shank Silver  Deming Drill 118SplitPoint YG1 D1191120
1 5 16 Black Gold 1 2Shank Silver Deming Drill 118SplitPoint YG1 D1191120
$84.32
1 1 4 Black  Gold 1 2Shank Silver  Deming Drill 118Split Point YG1 D1191116
1 1 4 Black Gold 1 2Shank Silver Deming Drill 118Split Point YG1 D1191116
$81.11
Champion Silver And Deming Drill 1 2 Shank XG12 19 32
Champion Silver And Deming Drill 1 2 Shank XG12 19 32
$15.00
NIB Norseman 29460 1 1 8 HSS Bright  Black Oxide Silver  Deming Drill Bit
NIB Norseman 29460 1 1 8 HSS Bright Black Oxide Silver Deming Drill Bit
$45.00
27 32 1 2 REDUCED SHANK SILVER  DEMING DRILL BIT MACHINIST SD IRWIN
27 32 1 2 REDUCED SHANK SILVER DEMING DRILL BIT MACHINIST SD IRWIN
$17.00
8pc JUMBO 6 HSS DRILL BIT SET SILVER  DEMING 9 16 1 1 2 shank
8pc JUMBO 6 HSS DRILL BIT SET SILVER DEMING 9 16 1 1 2 shank
$32.99
Machinist Black Gold 9 16 X 1 2 SHANK 3 flats SILVER  DEMING DRILL BIT SD
Machinist Black Gold 9 16 X 1 2 SHANK 3 flats SILVER DEMING DRILL BIT SD
$12.97
Machinist Black Gold 37 64 X 1 2 SHANK 3 flats SILVER  DEMING DRILL BIT SD
Machinist Black Gold 37 64 X 1 2 SHANK 3 flats SILVER DEMING DRILL BIT SD
$13.63
Machinist Black Gold 7 8 X 1 2 SHANK 3 flats SILVER  DEMING DRILL BIT SD
Machinist Black Gold 7 8 X 1 2 SHANK 3 flats SILVER DEMING DRILL BIT SD
$23.93
TMX 5 167 340 34mm Silver and Deming Drill 1 2 Shank High Speed Steel 6 1 2OAL
TMX 5 167 340 34mm Silver and Deming Drill 1 2 Shank High Speed Steel 6 1 2OAL
$24.95

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