Tormach 1100m BT30 Spindle Repair & Replace Spindle Bearings

13 hours ago
2 min read

This video has a detailed full teardown and replacement of the Tormach BT30 Spindle Bearings.

https://www.youtube.com/watch?v=8EooLj1NlrY

UPPER BEARINGS

The upper bearings are sitting on top of each other. There is no spacer.

These are the markings on the stock upper bearings

HP7006C-2RZTN12/P5

These are the markings on the upper bearings in the video, which the guy says he already previously replaced.
7006CTN1P5DBA
19014
CSC
Outer race = -4
Inner race = -3

REPLACEMENT UPPER BEARINGS

These are the replacement upper bearings

NSK brand
7008CTRDUL P4Y
904
DD-6336
D: A=-3, B=-3
d: A=-6, B=-6
C: -58

LOWER BEARINGS

The lower bearings have an inner and outer race spacer between them.

HP7008C-2RZTN1/P5 DBA

These are the markings on the stock lower bearings shown in the video. They have rubber seals.
HP7008C-2RZTN12/P5 DBA
TCHH95B8474
Outer race = -5
Inner race = -2

Inner race spacer width = 0.59305in
Outer race spacer width = 0.59305in

Breakdown of the Part Number:

7008: The dimensional series, representing a bore (inner diameter) of 40mm, an outer diameter of 68mm, and a width of 15mm.

C: Indicates a 15 contact angle, designed to handle high-speed rotation and primarily axial thrust loads.

-2RZ: Features non-contact rubber seals on both sides of the bearing to protect it from dust and debris while maintaining low friction for high-speed operation.

TN12: Indicates a Polyamide (Nylon) cage reinforced with fiberglass, designed for lightweight and high-speed operation.

/P5: The ISO P5 precision class (ABEC-5 equivalent), meaning it is manufactured with stricter dimensional and running tolerances than standard (P0/P6) bearings.

REPLACEMENT LOWER BEARINGS

These are the replacement lower bearings they used in the video. They do not have a rubber seal