As this is my first post here I'll start with thank you to all the knowledgeable folks here. I have been lurking for years and learned some ways to accomplish tasks with the tools I have on hand and better ways to approach my projects.
I recently bought a Chinesium (Accusize) drill bit set from Amazon in fractional, letter and number sizes as a backup set to the few good bits I already have. I do understand if you want good bits the best option is to buy the good ones as you need them. They were listed as 5% Cobalt (M35) 135° split point. First thing that jumped out, after the number bit rack fell off one side, was the gold coating. Then out of 20 I measured not one was 135° and many were 15-20° off with most at 120° or so. All of the smaller number sizes (#32+) and fractional smaller than 1\8" were nearly 1/3 off center and nothing smaller than 1/8" was split. Most bits were a tad undersized, which I think is good? but the 17\32 I miked was + 0.009, yikes. At least they were mostly round. I am pretty sure real M35 bits are not coated. I know you get what you pay for, most of the time, but that Mophorn Dividing Head with a 5" 3 Jaw Chuck I bought for less than $300 with 0.00025 TIR got my guard down. :-)
The questions...
What is the smallest size you can expect to be split in a 115 piece index? I have split 1\16" bits with a jig and a magnifier.
Would a 5% Cobalt bit be coated with a gold coating?
Is there any 115 drill piece index worth buying?
I really just wanted to have all the bits I need for my tap set which is almost every size up to 5\8" and up 13 mm.
Thanks,
Rich L. in Florida
I recently bought a Chinesium (Accusize) drill bit set from Amazon in fractional, letter and number sizes as a backup set to the few good bits I already have. I do understand if you want good bits the best option is to buy the good ones as you need them. They were listed as 5% Cobalt (M35) 135° split point. First thing that jumped out, after the number bit rack fell off one side, was the gold coating. Then out of 20 I measured not one was 135° and many were 15-20° off with most at 120° or so. All of the smaller number sizes (#32+) and fractional smaller than 1\8" were nearly 1/3 off center and nothing smaller than 1/8" was split. Most bits were a tad undersized, which I think is good? but the 17\32 I miked was + 0.009, yikes. At least they were mostly round. I am pretty sure real M35 bits are not coated. I know you get what you pay for, most of the time, but that Mophorn Dividing Head with a 5" 3 Jaw Chuck I bought for less than $300 with 0.00025 TIR got my guard down. :-)
The questions...
What is the smallest size you can expect to be split in a 115 piece index? I have split 1\16" bits with a jig and a magnifier.
Would a 5% Cobalt bit be coated with a gold coating?
Is there any 115 drill piece index worth buying?
I really just wanted to have all the bits I need for my tap set which is almost every size up to 5\8" and up 13 mm.
Thanks,
Rich L. in Florida