I arrived home today to find my latest tool purchase had arrived.
This is a Carmex SIR 0025 R22 internal threading bar, which takes 22mm inserts. The bar is 25mm diameter x 200mm long. I have purchased this especially to make internal threads to match the 6tpi spindle on my lathe.
After discussing my needs and options with PixMan, I was not going to go this route, as inserts in this size cost more and it is more economical to use the 16mm inserts which cover 8 - 40 tpi and are cheaper. However, I picked this up off eBay for under $40 AUD. I have ordered two 22IR 6UN BMA ($13.75 ea), which should last me a while.
Having cut an external 7/8" x 14 thread using a ER16 insert at PixMan's Dad's shop I was sold on them. The finish is excellent. Whilst I have an external HSS threading tool, I would have to buy a HSS boring bar (would you believe my only boring bar is a 5/8" SCLCR bar that I found!) to cut internal threads.
This is a Carmex SIR 0025 R22 internal threading bar, which takes 22mm inserts. The bar is 25mm diameter x 200mm long. I have purchased this especially to make internal threads to match the 6tpi spindle on my lathe.
After discussing my needs and options with PixMan, I was not going to go this route, as inserts in this size cost more and it is more economical to use the 16mm inserts which cover 8 - 40 tpi and are cheaper. However, I picked this up off eBay for under $40 AUD. I have ordered two 22IR 6UN BMA ($13.75 ea), which should last me a while.
Having cut an external 7/8" x 14 thread using a ER16 insert at PixMan's Dad's shop I was sold on them. The finish is excellent. Whilst I have an external HSS threading tool, I would have to buy a HSS boring bar (would you believe my only boring bar is a 5/8" SCLCR bar that I found!) to cut internal threads.
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