Speed is a multiplier. An imbalance too small to notice at low rpm becomes vibration at high rpm, and vibration becomes finish problems, shortened bearing life, and a spindle that never feels right no matter what else gets fixed. That is why balance is not an option on our bench. It is a step.
Run, test, and balance: the step every rebuild gets
Every spindle MZI rebuilds is run, tested, and dynamically balanced before it ships. It is step fifteen of the seventeen-step sequence in the rebuild process guide, and it comes after assembly for a reason: balance is a property of the assembled rotating system, and it is proven on the assembled unit, not assumed from the parts. Dynamic balancing is also a standing MZI service in its own right, covered on the balancing page, for spindles and rotating assemblies that need balance work without a full rebuild.
The proof continues after balancing. We run off each spindle prior to shipment, and the start-up procedure that ships with it calls for the spindle to be run off again by the customer before it goes back into operation. Both documents live in the Forms and Documents section of the hub.
What high speed changes
The higher the operating speed, the more the design leans motorized. As Ed Zitney has written in his published work on spindle design, the higher-speed end of the spectrum is dominated by motorized spindles running on high-frequency drives, often water-cooled, with the motor built into the cartridge so no power is lost through a belt, gear, or coupling. That integration is exactly what makes a high-speed rebuild a whole-unit job: motor winding testing, encoder testing, and proximity switch testing join the mechanical inspection, and the spindle types guide explains how each design shapes the work.
Precision underneath the speed
None of it matters if the geometry is off. The inspection behind every rebuild measures shaft bearing journals and the drawbar bore for runout with indicators reading to fifty millionths of an inch, and checks housing bores for size, alignment, and shoulder squareness, because balance on top of bad geometry is polish on a problem. Findings are documented to your spindle’s serial number and come back to you with the quotation, at no charge until your purchase order approves the rebuild.
Start with a phone call
Edward Zitney
President
(714) 475-4016
He has spent more than 44 years in spindle rebuilding and remanufacturing. He learned the trade over more than two decades at Precision Balancing & Analyzing, the shop long regarded in the industry as the standard for spindle work, later oversaw SKF Machine Tool Services, held service leadership roles at Setco, and wrote a published column on spindle remanufacturing for Fabricating & Metalworking.
Marco Guerrero
Partner
(949) 374-0060
He came up on the shop side of this industry. He started with his hands, welding and fabricating for the racing industry, then spent fifteen years as general manager growing a machining job shop, the same kind of shop that sends MZI spindles today. He has sold CNC machines too, so he knows what new equipment costs and when a rebuild is the smarter call. Today he and Ed are partners in MZI Precision, and his standard is simple: every customer feels informed and supported from the first call to the day the spindle ships back.
Call (714) 379-6505 and describe what changed. With a little information about your spindle we can diagnose the problem and determine your best action.
What to expect on the call:
- You talk directly with a spindle expert.
- Some problems can be diagnosed over the phone, and a few do not require removing the spindle at all.
- If your spindle should come in: disassembly, inspection, failure analysis, and a line-item quote, at no charge until your purchase order approves the rebuild.