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H1

Recommendation of N-CT FT

【英】困ったときの知恵袋詳細
Cutting Taps Metric Threads Trouble Shooting
We are tapping FC-250 castings in mass production on a machining center. Currently, the tap we use for cast iron is a FC-HT M5X0.8 with a 5 thread chamfer. We have no problems with cutting edge chipping and tap breakage but the GP-6H GO gauge measure tight around 3,000 holes. I would like to reduce the frequency of tap replacement and further improve processing time. Can you recommend better taps for this work?
I think the FC-HT is the best high speed steel HSS tap material for processing FC cast iron casting. You have said, "currently, we have no problems with cutting edge chipping or tap breaking," so I assume the tool life is simply because the tap wears out. It seems the processing environment and processing conditions are also in a good position. YAMAWA believes, a N-CT-FC carbide hand tap for cast iron would be the best recommended tap for improvement. The basic specification of the N-CT-FC carbide tap is the same as the FC-HT hand tap for cast iron, but since it is a cemented carbide tap, the processing tool life will be greatly increased. Please try processing the FC-250 cast iron with N-CT FC.

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