Before a quotation is written, every part of your spindle passes through MZI’s clean inspection room. This page is the checklist, published as we run it, because a list of specific measurements says more than any adjective could.
Before inspection: how parts get there
Every part is first examined visually, then cleaned and polished; polishing reveals minute damage that cleaning alone hides. Even the nuts are removed, polished, and tested for fit. Parts are solvent-washed and dried with clean compressed air. No rags or towels touch them: lint is bad news when parts go to assembly.
The mechanical checks
- Bearing journal size on the shaft, measured rather than assumed.
- Shaft bearing shoulders checked true and perpendicular to the seat.
- Housing bearing bore size.
- Tool nose interface (CAT, ISO, HSK, JARNO, or lathe nose), checked for size, gage line, and runout.
- Runout of the shaft bearing journals. Runout is checked with dial indicators reading to fifty millionths of an inch (0.00005″).
- Runout of the shaft drawbar I.D.
- Housing bore alignment and shoulder squareness.
- Spacers between bearings, checked for parallelism and flatness.
- Drawbar pull force.
- Disc springs, checked for wear or breakage.
The electrical checks
- Encoder testing.
- Proximity switch testing: sensor, settings, gap, and pickup.
- Motor testing on integral-motor spindles.
The electrical checks matter because faults cross categories: a “sensor problem” can be mechanical and a “bearing noise” can be electrical. One documented MZI investigation began with a proximity switch that tested perfectly, which forced the search to the mechanical root cause. That story is in the failure analysis guide.
What happens with the results
The measurements become the quotation: every part needing replacement (bearings, O-rings, seals, encoders, proximity sensors) is priced line by line, and anything needing rework is identified. You see all of it before deciding anything, and there is no charge for the inspection or the quote until your purchase order approves a rebuild. The full sequence is in the rebuild process guide.
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.