Description
Size-specific context
Where JDLB 75 sits in the range
JDLB 75 is the first principal size in this range associated with the 1 arc-minute P0 drive-level backlash grade and a 13 mm documented adjustment distance. The dual-lead principle lets the assembled mesh be adjusted by moving the worm axially; it does not make the bare shaft interchangeable with another family size.
If a machine calls for the size-75 P0 grade, quote the complete adjustment and wheel condition. The 1 arc-minute figure belongs to the assembled and adjusted drive, not to a bare worm-shaft tolerance.
JDLB 75 size and adjustment data
| Parameter | Specification / guidance |
|---|---|
| Series size | JDLB 75 |
| Drive concept | Dual-lead worm drive with axial backlash adjustment |
| Documented ratio contexts | 14.5, 19.5, 24.5*, 30, 40*, 45, 50*, 60, 80*, 90 |
| Lead-angle examples | 14°02′ at 14.5; 11°18′ at 19.5; 7°07′ at 30; 5°13′ at 45; 4°05′ at 60; 2°56′ at 90 |
| Adjustment distance V | 13 mm |
| Adjustment coefficient k | 0.02–0.06 mm⁻¹ |
| Clearance adjustment ΔSd | 0.26–0.78 mm |
| Input shaft diameter J | 24 mm |
| Envelope A / B / C | 172 / 208 / 82 mm |
| Drive-level P0 grade | 1 arc minute |
| Drive-level P1 grade | 2–4 arc minutes |
| Documented output radial load Fr2 | 10000 N |
| Documented output axial load Fa2 | 10000 N |
| Material / heat treatment of replacement shaft | Confirm from ordered drawing or approved project specification |
Selected JDLB 75 performance references
| Ratio context | Documented performance reference |
|---|---|
| Ratio 14.5 | At n1=1400 min⁻¹: dynamic efficiency 0.84; rated input power 2.3 kW; output torque 200 Nm; output speed 96.6 min⁻¹. |
| Ratio 45 | At n1=1400 min⁻¹: dynamic efficiency 0.69; rated input power 1.1 kW; output torque 216 Nm; output speed 31.1 min⁻¹. |
| Ratio 90 | At n1=1400 min⁻¹: dynamic efficiency 0.56; rated input power 0.6 kW; output torque 185 Nm; output speed 15.6 min⁻¹. |
Adjustment data for JDLB 75
The documented adjustment range for size 75 uses V=13 mm, k=0.02–0.06 mm⁻¹ and ΔSd=0.26–0.78 mm. These values describe the reducer adjustment context and should not be converted into a standalone tooth tolerance on a replacement shaft.
Ratio, starts and replacement identification
The size-75 mesh table spans these documented ratio contexts: 14.5, 19.5, 24.5*, 30, 40*, 45, 50*, 60, 80*, 90. Worm start count and lead angle change with the selected ratio, so the reducer size alone is not enough to manufacture a replacement worm.
When the old shaft is worn, read the ratio plate or gearbox record and inspect the mating wheel before finalizing tooth geometry. For JDLB 75, also include the shaft end interfaces and bearing-journal dimensions in the same RFQ.
Replacement RFQ
What to send for a JDLB 75 quote
Send the size-75 reducer reference, ratio, quantity, current worm-shaft drawing or measured sample, and the mating-wheel condition. Mark any surfaces affected by wear so measured damage is not treated as intended geometry.
For JDLB 75, the order review should reflect that the first principal size in this range associated with the 1 arc-minute P0 drive-level backlash grade and a 13 mm documented adjustment distance. State the requested 1 arc minute P0 or 2–4 arc minutes P1 drive grade as an assembled-mesh target and include the wheel condition plus the documented V=13 mm adjustment context.
Frequently asked questions
Is the 1 arc-minute P0 grade specific to the bare JDLB 75 worm shaft?
No. It is a drive-level backlash grade for the adjusted JDLB 75 assembly. The mating wheel, bearings, center distance and axial setting all contribute.
Can JDLB 75 be ordered from the size number alone?
No. The 75 family still contains different ratio/start/lead conditions. Send the ratio and current shaft or wheel data so the tooth relationship can be confirmed.
What if the JDLB 75 wheel is also worn?
Quote the size-75 worm and wheel together when wear or contact condition makes the original mesh uncertain. Pair-level review avoids treating a damaged mating member as a valid reference.
Replacement / service
Use JDLB 75 as a drive-family reference, then confirm the actual shaft
The JDLB 75 page carries documented series context for a dual-lead worm drive, including size-specific envelope, adjustment and selected drive-performance references already shown above. Those figures describe the drive family; they do not define every bearing journal, end feature or replacement shaft dimension.
For the larger JDLB 75 family, include the operating load context as well as the ratio, wheel and shaft interfaces. A service shaft should not be selected only from the outside envelope when bearing condition or wheel wear may be contributing to the complaint.
JDLB 75 order-release checklist
| Release item | Information to supply |
|---|---|
| Drive identity | JDLB 75 size reference plus ratio / model information. |
| Existing shaft | Drawing, sample, or trusted dimensions for journals, shoulders and input/end interfaces. |
| Mating wheel | Current wheel condition and identifying data; include it when tooth geometry or contact is uncertain. |
| Adjustment state | Current axial adjustment/reference position and the reason for replacement or backlash correction. |
| Duty | Input speed, load/torque context, reversals and lubrication condition. |
| Inspection | State whether the order needs dimensional records, material/treatment evidence or pair/assembly checks. |
Where the JDLB 75 shaft sits in a multi-unit drive context
Where size-75 units are coordinated on a common shaft, submit the coupling and station spacing used in the machine. That information is especially important when the line has multiple supports or maintenance-removable sections.
Quote from the real interfaces
Request a Quote / Send RFQ
Send the model or drawing reference, quantity, application and the geometry that controls fit and mesh. Unknown values can be identified for confirmation rather than guessed.
