The JU070XP0 sealed four-point contact bearing measures 177.8 × 196.85 × 12.7 mm and corresponds to LYDL-070UU in the LYDL catalog.
For reversing motion, specify angular travel, cycle frequency, dwell and loading through the full stroke. A maximum-rpm figure alone does not describe a short-angle oscillating duty.
Ask LYDL to review lubrication, internal configuration and acceptance requirements for the actual motion profile.
The JU070XP0 sealed four-point contact bearing is a seven-inch, double-sealed Type X reference with a 177.8 × 196.85 × 12.7 mm envelope. Its LYDL catalog identity is LYDL-070UU.
An oscillating axis repeatedly visits the same angular region. For this duty, the inquiry should describe the full motion pattern rather than convert it into a single average rpm.
| Dimension | Inches | Millimeters |
|---|---|---|
| Bore, d | 7.000 | 177.800 |
| Outside diameter, D | 7.750 | 196.850 |
| Axial width, B | 0.500 | 12.700 |
| Radial section | 0.375 | 9.525 |
Identify the neutral position, both travel limits and the ring that moves. These do not alter the nominal dimensions, but they determine how the assembly and duty should be evaluated.
The LYDL sealed Type X series table identifies this size as LYDL-070UU. Nominal dimensions do not replace the approved tolerances and supply specification.
Send a time-versus-angle trace if available. Otherwise, list the movement, dwell and load states in sequence. Include emergency stopping and parked vibration where relevant.
| Motion input | Why it matters to the review |
|---|---|
| Angular excursion | Distinguishes a small repetitive stroke from a broad sweep |
| Peak speed and acceleration | Identifies transient motion demands |
| Reversal frequency | Describes how often the motion changes direction |
| Dwell and parked conditions | Captures loading and vibration while nominally stationary |
| Force direction through travel | Shows whether the contact-loading pattern changes |
Lubrication suitability and wear behavior should be evaluated for this duty. Do not assume that converting total angular travel into equivalent revolutions proves the same life as continuous rotation.
Where testing is required, agree the representative motion and load schedule before selecting an arbitrary cycle count. A demonstration at no load is not an endurance validation.
Submit the JU070XP0 motion cycle for application review.
| Rating | Converted SI value |
|---|---|
| Dynamic radial | 8.590 kN |
| Dynamic axial | 13.923 kN |
| Dynamic moment | 603.452 N·m |
| Static radial | 15.791 kN |
| Static axial | 39.456 kN |
| Static moment | 1477.842 N·m |
These rounded values are converted from the Kaydon JU070XP0 entry in reference [1], not confirmed LYDL performance. Dynamic ratings use a one-million-revolution L10 basis; static values assume rigid support. Full ratings cannot be applied simultaneously. The listed 350 rpm limit carries the catalog condition of loads up to 20% of dynamic capacity. Confirm the actual duty and LYDL supply ratings before approval.
A positioning cradle may sweep between two angles, pause for a process and return. Compare the measured output angle with the command in both directions under a defined load. Reversal error may include transmission backlash, structural compliance and bearing behavior.
Separate these contributors before changing bearing preload. A tighter bearing is not a universal remedy for reversal error. This is an illustrative evaluation method, not a guaranteed accuracy claim.
Ask for a grease and seal configuration appropriate to stroke, temperature and contamination. Define access for inspection or maintenance where the machine requires it.
Neither double sealing nor low average speed alone establishes lifetime lubrication. If a maintenance interval is needed, base it on the selected configuration, duty and supporting validation. Protect the assembled support from unnecessary vibration during transport and storage.
| Brand | Reference | Naming notes |
|---|---|---|
| KAYDON | JU070XP0 | J: standard steel with two nitrile seals; X: four-point contact; P: separator code; final 0: precision code. |
| INA / Schaeffler | CSXU 070.2RS | CSX: four-point family; U: section series; .2RS: sealing on both sides. |
| NSK | NBX17712DD | Sealed NBX catalog configuration; retain the DD suffix when checking the complete designation. |
The cited entries share the nominal 177.8 × 196.85 × 12.7 mm envelope. Compare tolerances, internal condition, sealing and rating methods before interchange. A brand suffix is not a LYDL accuracy or performance guarantee.
JU060XP0 uses a 152.4 × 171.45 × 12.7 mm envelope; JU080XP0 uses 203.2 × 222.25 × 12.7 mm. These adjacent seat sizes are options for a new layout, not proof of better oscillation life. See the sealed Type X product category.
For the separate issue of starting resistance, the JU040XP0 discussion of drive torque explains which test conditions to specify; its numerical values do not apply to JU070XP0.
Define the test load, angle, velocity profile, dwell and measurement location. Record output behavior and torque in both directions at agreed intervals. Use consistent temperature conditions when comparing results.
The LYDL proposal should identify materials, cage, seals, lubricant, accuracy, internal condition and confirmed performance ratings. Retain the batch identity with the test record so changes in configuration remain traceable.
No. Include excursion, reversal rate, acceleration, dwell and load direction. Two duties with the same average angular travel can expose the bearing to different operating conditions.
Do not add a motion routine without reviewing the complete machine and lubricant requirements. Any conditioning movement must be safe for cables, stops and the process, and validated for the selected configuration.
External vibration can create relative movement even when the drive is stationary. Describe storage, transport and parked operating conditions rather than assuming that zero commanded speed means no mechanical duty.
It may change one contributor, but backlash elsewhere and structural deflection remain. Measure the error sources first and evaluate torque, heat and life before specifying a different internal condition.
A documented load and motion schedule representative of service, with defined inspection intervals and failure criteria. Include temperature, contamination and lubrication conditions; a cycle number by itself is incomplete.
Identify JU070XP0 / LYDL-070UU and attach a time-angle trace or cycle description. Request a duty-specific drawing review and quote.
These catalogs document reference products; they are not LYDL product certifications.
