Glossary of Terms

The diameter that the crimping machine is set to in order to achieve an actual crimp diameter which is inside the tolerance limits.

Manuli Hydraulics uses a standard tolerance of +0.0/-0.2mm for hose crimping specifications.

In order to successfully and repeatedly achieve a crimping result which is considered “in-tolerance”, it is advisable to set the target crimping diameter to the value which lies in the middle of the tolerance range.

Example:

DN = 23.5mm+0.0/-0.2

So:

Max. allowable diameter = 23.5mm

Min. allowable diameter = 23.3mm

Therefore:

Suggested DT = 23.4mm

The difference between the actual crimping diameter and the target crimping diameter during

the preliminary setup.

C = D_A – D_T

Crimping control device used on crimping machines to precisely control the crimping diameter.

Note: Set-stops vary between crimping machines and the types used on Manuli Hydraulics machines are listed below.

Functionality is based on a pin achieving a set final position as proof that the target crimping diameter has been reached.

Used on basic or manual crimping machines, although less commonly used on modern equipment.

Note: The process for setting the initial target crimping diameter for this set-stop type is explained in section 9.2.

Mechanical Visual and

Acoustic Set-Stop

Functionality is similar to the Mechanical Visual Set-Stop but with the addition of an audio alert when the target crimping diameter is reached.

Used on basic or manual crimping machines, although less commonly used on modern equipment.

Note: The process for setting the initial target crimping diameter for this set-stop type is explained in section 9.2.

Functionality is based around a mechanically positioned pin activating a switch when the target crimping diameter is reached.

A digital position indicator is used to set the target crimping diameter.

This type of set-stop is usually associated with SC type control panels.

Note: The process for setting the initial target crimping diameter for this set-stop type is explained in section 9.2.

Functionality is based around an electronic transducer. This generates a specific output voltage which varies linearly according to the current position of the transducer.

The variable voltage is interpreted by the software to determine the precise position of the crimping jaws, and by inference, the crimping diameter.

This type of set-stop is usually associated with SCE or SCS control panel types.

Note: The process for setting the initial target crimping diameter for this set-stop type is explained in section 9.2.

Vernier dial gauge used to set the position of the electro-mechanical visual set-stop.

Coloured numbers indicate 1mm and 0.01mm increments, so a reading of 100 indicates a change to the target crimp diameter of 1.00mm.

Basic smart control panel used on the modern generation of Manuli Hydraulics crimping machines.

Usually used in conjunction with the electromechanical visual set-stop.

Safe Crimp Electrical

Control Panel

Advanced crimping system with additional calibration and measurement features.

Usually used in conjunction with the electronic setstop.

A _±x.xx

A _+x.xx/-x.xx

The amount that a given dimension may vary from the nominal value whilst still being accepted as correct.

It is usually specified as an upper and lower limit.

Tolerances may be symmetrical (eg. 55.4mm ±0.1) or asymmetrical (eg. 55.4mm +0.0 /-0.2).

Note: If the specified tolerance is symmetrical then D_N = D_T

Some fitting types require the removal of rubber from the end of the hose.

The most common type of skiving is known as “external skiving”, and involves rubber being removed from the outer cover of the hose.

In addition, some fitting types may also require removal of rubber from the inside of the hose bore.

This is known as “internal skiving”