Taper Ball Mills

Re: Taper Ball Mills

Postby Rcnewcomb » Sun Feb 26, 2017 9:48 pm

Update from Randall...
Ordered: 2017-Feb-09
Received: 2017-Feb-25
Paid: $18.88 with free shipping (=$4.72 per bit)

Mfg, Text, Description
Sytool HRC55 R1 *15ϕ3.175*38-2F (radius=1.0mm Per side angle B=2.24°) R1.0* D3.175*15*38mm
Sytool HRC55 R0.75 *15ϕ3.175*38-2F (radius=0.75mm Per side angle B=3.20°) R0.75*D3.175*15*38mm
Sytool HRC55 R0.5 *15ϕ3.175*38-2F (radius=0.5mm Per side angle B=4.15°) R0.5*D3.175*15*38mm
Sytool HRC55 R0.25 *15ϕ3.175*38-2F (radius=0.25mm Per side angle B=5.09°) R0.25*D3.175*15*38mm

All shanks measured the correct diameter within the tolerance of my Harbor Freight/Pittsburg calipers
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Re: Taper Ball Mills

Postby Xxray » Sun Feb 26, 2017 10:05 pm

Good writeup Leo, glad they worked out for you. The 1 thing you didn't and couldn't cover, resiliency, can only be gauged with time.

I personally very much consider the "made in USA' angle as well, that is obviously up for individuals to decide. Put it this way - I'd hate to see the day when the only option for bits was asia.
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Re: Taper Ball Mills

Postby martin54 » Mon Feb 27, 2017 2:24 am

Interesting report Leo thanks, I think the key to all this is what you said here:

Reliability / Repeatability wise - I don't know, but based on these 5 cutters, visually, they all "look" the same and they all "look" good. They ARE CNC ground and the Chinese ARE learning to do better quality. I have a high level of confidence that they will be repeatable

Finding the right sellers is I still think the key, problem is that it is so easy to set up & manufacture stuff in China that even the reputable Chinese Companies are getting their good cloned :lol: :lol:

If you have found a supplier of Bits that are good quality & at an attractive price then that's great but I wouldn't expect all the cheap Chinese bits being sold on auction sites to be of the same quality, looking forward to seeing how others get on with their cutters :lol:
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Re: Taper Ball Mills

Postby Leo » Mon Feb 27, 2017 3:24 am

China is forever changing and being able to get the same thing from the same seller will be a challenge and not an expected result.

I plan to stock up on the sizes I need.

This user forum in only partly USA populated, but I think the sentiment would be similar elsewhere as well. I REALLY want to support USA manufacturing. After all that if my profession. I am a manufacturing engineer and I watch USA companies closing the doors all to often. HOWEVER, the cost of cutters is HIGH, particularly when we are active in the hobby and wear out the cutters. I recently bought 6 cutters on the USA market and paid $244. I also bought 5 of these Chinese cutters and paid $45. I really WANT to buy USA, but the price difference is just too much to ignore.
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