Hss Taps

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what's the best way to tap low grade aluminium ?

this may be in the wrong catagory but it's the closet thing i could find.

i need to tap a series of 1/2" BSP threads in some aluminium bar but cannot do it on the CNC machine as the tap picks up the swarf and starts to make a mess of the threads.
better grade material is out of the question because of the cost.
what's the best solution.

currently using a straight 4 flute HSS tap

have you tried spiral flute taps? the chips will be removed directly from the hole without stopping.

Discover Hss Taps On eBay Below:

M16 X 100 HIGH SPEED STEEL 4 FLUTE BOTTOM TAP
M16 X 100 HIGH SPEED STEEL 4 FLUTE BOTTOM TAP
$24.09
TTC 1 1 4 11 HSS RH BSPP 55 Whitworth Thread British Pipe Tap
TTC 1 1 4 11 HSS RH BSPP 55 Whitworth Thread British Pipe Tap
$187.70
M8 X 125 D5 3 FLUTE HIGH SPEED STEEL TiN COATED SPIRAL POINT PLUG TAP
M8 X 125 D5 3 FLUTE HIGH SPEED STEEL TiN COATED SPIRAL POINT PLUG TAP
$21.49
M4 X 70 D4 HIGH SPEED STEEL PLUG TAP
M4 X 70 D4 HIGH SPEED STEEL PLUG TAP
$5.99
USA 502962 5 8 11 NC GH3 HSS 4 Flute Tap
USA 502962 5 8 11 NC GH3 HSS 4 Flute Tap
$19.99
2pcs 40mm Total Length 3 Flutes HSS Machine Screw Thread Taper Taps
2pcs 40mm Total Length 3 Flutes HSS Machine Screw Thread Taper Taps
$3.00
Hand Tap Set3 PCHSSM8 125D5 Limit WIDIA GTD 14800
Hand Tap Set3 PCHSSM8 125D5 Limit WIDIA GTD 14800
$29.99
Hand Tap Set3 PCHSS5 16 18H3 Limit WIDIA GTD 14095
Hand Tap Set3 PCHSS5 16 18H3 Limit WIDIA GTD 14095
$28.49
2 56 GH2 HIGH SPEED STEEL 2 FLUTE SPIRAL POINT PLUG TAP
2 56 GH2 HIGH SPEED STEEL 2 FLUTE SPIRAL POINT PLUG TAP
$9.09
Hand Tap Set3 PCHSSM6 10D5 Limit WIDIA GTD 14784
Hand Tap Set3 PCHSSM6 10D5 Limit WIDIA GTD 14784
$29.69
High Speed Steel HSS 3 Flute RC1 8 Metric Thread Taper Pipe Tap
High Speed Steel HSS 3 Flute RC1 8 Metric Thread Taper Pipe Tap
$17.67
9 16 18 Hanson Whitney 25513 BOTTOM Tap High Speed Steel USA 41 NC
9 16 18 Hanson Whitney 25513 BOTTOM Tap High Speed Steel USA 41 NC
$13.65
Drill America DWTSMT15X1 HSS Metric Tap Special Size M15 x 1
Drill America DWTSMT15X1 HSS Metric Tap Special Size M15 x 1
$64.07
9 16 18 Hanson Whitney 25512 PLUG Tap High Speed Steel USA 41 NC
9 16 18 Hanson Whitney 25512 PLUG Tap High Speed Steel USA 41 NC
$13.65
9 16 18 Hanson Whitney 25511 TAPER Tap High Speed Steel USA 41 NC
9 16 18 Hanson Whitney 25511 TAPER Tap High Speed Steel USA 41 NC
$13.65
1 2 20 Hanson Whitney PLUG Tap High Speed Steel USA 4 Flute 24
1 2 20 Hanson Whitney PLUG Tap High Speed Steel USA 4 Flute 24
$8.77
High Speed Steel HSS M4 3 Flutes Machine Screw Thread Tap 100mm Length
High Speed Steel HSS M4 3 Flutes Machine Screw Thread Tap 100mm Length
$4.05
1 64 GH1 HSS 2 FLUTE PLUG TAP Made in USA
1 64 GH1 HSS 2 FLUTE PLUG TAP Made in USA
$10.29
1 64 GH2 HSS 2 FLUTE PLUG TAP Made in USA
1 64 GH2 HSS 2 FLUTE PLUG TAP Made in USA
$10.29
1 72 GH1 HSS 2 FLUTE PLUG TAP Made in USA
1 72 GH1 HSS 2 FLUTE PLUG TAP Made in USA
$10.29
2pcs 3 8 24 H3 3 Flute Spiral Point Plug S HSS TiCN CNC Stainless Combo Tap YG1
2pcs 3 8 24 H3 3 Flute Spiral Point Plug S HSS TiCN CNC Stainless Combo Tap YG1
$52.18
5 8 24 H3 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 750 6101
5 8 24 H3 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 750 6101
$17.62
7 16 14 H3 4 Flute Plug Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A5523
7 16 14 H3 4 Flute Plug Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A5523
$11.02
1 4 28 H3 4 Flute Bottom Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A7423
1 4 28 H3 4 Flute Bottom Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A7423
$4.89
7 16 20 H3 4 Flute Plug Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A5543
7 16 20 H3 4 Flute Plug Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A5543
$11.02
3 8 24 H3 4 Flute Plug Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A5503
3 8 24 H3 4 Flute Plug Hand Tap HSS V ANSI Shank Non CNC Style YG 1 A5503
$6.36
USA 5 8 11 NC GH3 HSS 4 Flute Tap
USA 5 8 11 NC GH3 HSS 4 Flute Tap
$19.99
KODIAK KCT207986 12 28 SPIRAL POINT 2 FLUTE HIGH SPEED STEEL THREADING TAP
KODIAK KCT207986 12 28 SPIRAL POINT 2 FLUTE HIGH SPEED STEEL THREADING TAP
$13.98
M22 x 150 D6 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 775 233
M22 x 150 D6 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 775 233
$35.37
1 3 8 16 UN HSS TAP 6 FLUTE RIGHT HAND THREAD NEW OLD STOCK FAST SHIPPING
1 3 8 16 UN HSS TAP 6 FLUTE RIGHT HAND THREAD NEW OLD STOCK FAST SHIPPING
$50.00
OSG 15940 00 7 16 14NF 3FLUTES CLEAR HSS +005 SPIRAL POINT PLUG HAND TAP
OSG 15940 00 7 16 14NF 3FLUTES CLEAR HSS +005 SPIRAL POINT PLUG HAND TAP
$15.99
OSG 1591800 3 8 24 3FLUTES CLEAR HSS +005 SPIRAL POINT PLUG HAND TAP
OSG 1591800 3 8 24 3FLUTES CLEAR HSS +005 SPIRAL POINT PLUG HAND TAP
$12.99
CLEVELAND C54663 7 16 20NF 4FLUTES CLEAR HSS G H3 BOTTOMING HAND TAP
CLEVELAND C54663 7 16 20NF 4FLUTES CLEAR HSS G H3 BOTTOMING HAND TAP
$15.99
M8 x 100 D5 4 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 775 117
M8 x 100 D5 4 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 775 117
$5.13
M20 x 150 D6 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 775 213
M20 x 150 D6 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 775 213
$30.09
M18 x 100 D6 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 775 198
M18 x 100 D6 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 775 198
$27.66
9 16 32 H3 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 750 6002
9 16 32 H3 4 Flute Bottom Hand Tap M2 High Speed Steel TMX Toolmex 5 750 6002
$17.11
7 16 26 H3 4 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 750 5707
7 16 26 H3 4 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 750 5707
$7.84
6 48 H3 4 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 752 5227
6 48 H3 4 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 752 5227
$7.33

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