🔧 Precision Milling Arbors Mandrels - Enhanced Expansion for Optimal Performance Review

This product has revolutionized my machining experience. Industrial and scientific-grade quality with an impressive range of sizes means endless possibilities. Through trial and error, I found that its strength lies in its ability to expand uniformly and precisely without any wobble. The only downside is its price tag, but the durability and precision make it a worthy investment. As a professional machinist, I highly recommend this versatile and high-performing tool.

I received my item today. However, the set was missing a 1" expandable mandrel. The holes in the wood holder weren't drilled to the right size and some of the parts I received didn't fit properly or didn't fit at all.

I bought these to compare with products that are 2-3 times more expensive. I was surprised. I only needed 7/8". It showed a TIR runout of 0.00015 when assembled on a new milling machine with about the same TIR. The cone on the head of the jackbolt had the same runout and was very smooth, ground. appeared to have been carved on the steps of a staircase. Unusable. But it took me about 3 minutes, spinning on my lathe against a small 200 grit cone sander in my Dremel to smooth it out to perfection.