Hss Tap

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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 Tap On eBay Below:

New 1pc 20mm HSS Reduced Shank Twist Drill Bit Shank Diameter 1 2 inch
New 1pc 20mm HSS Reduced Shank Twist Drill Bit Shank Diameter 1 2 inch
$14.99
2 1 4 8 N HSS GH6 TAP
2 1 4 8 N HSS GH6 TAP
$125.00
2 1 4 12 H6 6 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 750 1547
2 1 4 12 H6 6 Flute Plug Hand Tap M2 High Speed Steel TMX Toolmex 5 750 1547
$223.06
1 2 16 HSS Right hand Thread Tap 1 2 16 TPI
1 2 16 HSS Right hand Thread Tap 1 2 16 TPI
$13.50
1 2 32 HSS Right hand Thread Tap 1 2 32 TPI
1 2 32 HSS Right hand Thread Tap 1 2 32 TPI
$13.50
1pc HSS Machine7 16 27 UNS Plug Tap and 1pc 7 16 27 UNS Die Threading Tool
1pc HSS Machine7 16 27 UNS Plug Tap and 1pc 7 16 27 UNS Die Threading Tool
$13.45
1pc HSS Machine 9 16 28 UN Plug Tap and 1pc 9 16 28 UN Die Threading Tool
1pc HSS Machine 9 16 28 UN Plug Tap and 1pc 9 16 28 UN Die Threading Tool
$17.99
7 16 20 HSS Right hand Thread Tap 7 16 20 TPI
7 16 20 HSS Right hand Thread Tap 7 16 20 TPI
$10.00
New1pc 1 1 16 16 UN Die and 1pc HSS Machine 1 1 16 16 UN Plug Tap Threading Tool
New1pc 1 1 16 16 UN Die and 1pc HSS Machine 1 1 16 16 UN Plug Tap Threading Tool
$44.50
7 16 27 HSS Right hand Thread Tap 7 16 27 TPI
7 16 27 HSS Right hand Thread Tap 7 16 27 TPI
$12.00
7 16 28 HSS Right hand Thread Tap 7 16 28 TPI
7 16 28 HSS Right hand Thread Tap 7 16 28 TPI
$12.00
7 8 9 NC Extended Tap 10 Long HSS USA
7 8 9 NC Extended Tap 10 Long HSS USA
$25.00
M8 X 05 HSS INTERMEDIATE HAND SCREW TAP 2x
M8 X 05 HSS INTERMEDIATE HAND SCREW TAP 2x
$10.00
Lot Of Quality HSS Taps 1 1 8NS to 1 8 27 NPT Vermont BTI Winter Machinist
Lot Of Quality HSS Taps 1 1 8NS to 1 8 27 NPT Vermont BTI Winter Machinist
$12.99
Drillco Cutting Tools 20E010FP HSS Plug Taps 10 32 Set Of 12 A68
Drillco Cutting Tools 20E010FP HSS Plug Taps 10 32 Set Of 12 A68
$65.00
35mm x 1 Metric HSS Right hand Tap M35 x 10mm Pitch
35mm x 1 Metric HSS Right hand Tap M35 x 10mm Pitch
$57.80
NEW Drillco 2000E HSS Plug Tap 1 1 4 7H4 HS 20E216CP
NEW Drillco 2000E HSS Plug Tap 1 1 4 7H4 HS 20E216CP
$49.99
New1pc HSS Machine 1 3 8 18 UN Plug Tap and 1pc 1 3 8 18 UN Die Threading Tool
New1pc HSS Machine 1 3 8 18 UN Plug Tap and 1pc 1 3 8 18 UN Die Threading Tool
$86.00
Greenfield 1 1 4 18 NEF Tapering Extended Tap 12 Long HSS
Greenfield 1 1 4 18 NEF Tapering Extended Tap 12 Long HSS
$124.95
1pc 1 5 16 28 UN Die and 1pc HSS Machine 1 5 16 28 UN Plug Tap Threading Tool
1pc 1 5 16 28 UN Die and 1pc HSS Machine 1 5 16 28 UN Plug Tap Threading Tool
$89.00
3mm x 05 HSS Cobalt Right hand Thread Tap M3 x 05mm for Stainless Steel
3mm x 05 HSS Cobalt Right hand Thread Tap M3 x 05mm for Stainless Steel
$6.79
6mm x 1 HSS Cobalt Right hand Thread Tap M6 x 10mm for Stainless Steel
6mm x 1 HSS Cobalt Right hand Thread Tap M6 x 10mm for Stainless Steel
$7.99
32mm x 35 Metric HSS Right hand Tap M32 x 35mm Pitch
32mm x 35 Metric HSS Right hand Tap M32 x 35mm Pitch
$42.99
1 11 16 12 HSS Right hand Thread Tap 1 11 16 12 TPI
1 11 16 12 HSS Right hand Thread Tap 1 11 16 12 TPI
$69.99
5pcs Metric M3 M8 HSS Steel Spiral Straight Fluted Screw Tap Woodworking Tool
5pcs Metric M3 M8 HSS Steel Spiral Straight Fluted Screw Tap Woodworking Tool
$2.74
New 1pc HSS Machine 1 16 27 NPT Plug Tap and 1pc 1 16 27 NPT Die Threading Tool
New 1pc HSS Machine 1 16 27 NPT Plug Tap and 1pc 1 16 27 NPT Die Threading Tool
$15.50
5 16 24 NF HSS GH3 Taps 4 Flute Lot Of 3 2 Plug 1 Bottom
5 16 24 NF HSS GH3 Taps 4 Flute Lot Of 3 2 Plug 1 Bottom
$9.00
New1pc 1 5 16 16 UN Die and 1pc HSS Machine 1 5 16 16 UN Plug Tap Threading Tool
New1pc 1 5 16 16 UN Die and 1pc HSS Machine 1 5 16 16 UN Plug Tap Threading Tool
$80.00
3 8 27 HSS Right hand Thread Tap 3 8 27 TPI
3 8 27 HSS Right hand Thread Tap 3 8 27 TPI
$9.70
Tap  Die Lot HSS Cutting Tool HSS Mixed Machinist Threaded GREENFIELD +
Tap Die Lot HSS Cutting Tool HSS Mixed Machinist Threaded GREENFIELD +
$3.99
52mm x 4 Metric HSS Right hand thread Tap M52 x 40mm Pitch
52mm x 4 Metric HSS Right hand thread Tap M52 x 40mm Pitch
$155.00
Widell Tap 18083 2 3 4 16 Plug Tap HSS H 7 Used
Widell Tap 18083 2 3 4 16 Plug Tap HSS H 7 Used
$120.00
H1 HSS 4 Flute 12mm x 15mm Taper and Plug Metric Tap M12 x 15mm Pitch D4T8
H1 HSS 4 Flute 12mm x 15mm Taper and Plug Metric Tap M12 x 15mm Pitch D4T8
$3.63
3 8 28 HSS Right hand Thread Tap 3 8 28 TPI
3 8 28 HSS Right hand Thread Tap 3 8 28 TPI
$9.70
1 HSS Right Hand Tap 1 5 8 12UN Taps Threading 1 5 8 12 high quality
1 HSS Right Hand Tap 1 5 8 12UN Taps Threading 1 5 8 12 high quality
$32.00
3 8 40 HSS Right hand Thread Tap 3 8 40 TPI
3 8 40 HSS Right hand Thread Tap 3 8 40 TPI
$9.70
1 1 4 18 HSS Right hand Thread Tap
1 1 4 18 HSS Right hand Thread Tap
$80.00
USED YG 1 8 GH6 11871446 T2786C HSS EX
USED YG 1 8 GH6 11871446 T2786C HSS EX
$25.00
M25 x 025 HSS Right hand Tap CAPT2012
M25 x 025 HSS Right hand Tap CAPT2012
$19.94

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