HIWIN QHH-CA Quiet Heavy Load Linear Guideway Block

The HIWIN QHH-CA is the square, heavy load block of the QH series, a quiet linear guideway with SynchMotion technology. The balls are separated by partitions, which lowers noise and rolling resistance fluctuation, and the QH block runs on the same rail as the HG series, so it can be used where noise, dust generation and high speed matter.

A quiet, self-lubricating alternative to the HG block

HIWIN builds the QH on the four-row circular-arc contact of the HG, then adds SynchMotion partitions between the balls. The catalog lists four results: lower noise, because the balls no longer collide; a self-lubricant design, in which the hollow partitions store lubricant that can be refilled; smoother movement, because rolling-resistance variation is reduced; and good high-speed performance. HIWIN reports a 4000 km load test at 5 kN with no damage to balls or raceway, and a 9500 km run at 130 m/min.

Because the QH and HG share identical rails, the designer does not have to change the rail when moving to QH. Listed applications are automation devices, high-speed transportation equipment, precision measuring equipment and semiconductor manufacturing equipment.

Technical specifications

Size range and load ratings of the QHH block

H is the assembled height, W the block width, L the block length, C and C0 the basic dynamic and static load ratings, then block mass and rail mass per metre. The flange QHW dimensions are in the catalog extract.

Ordering code, preload and selection

A QH model number follows the HG pattern: series, block type, size, load type, block mounting, blocks per rail, rail mounting, rail length, accuracy, preload, rails per axis, dust protection and options such as E2 and RC. Interchangeable blocks and rails come in C, H and P accuracy with Z0 or ZA preload; non-interchangeable sets add SP, UP and ZB. The interchangeable rail is ordered as an HGR rail.

Choose ZA for precision machines and measuring equipment, Z0 for light, low-impact transport axes and ZB where rigidity under vibration is needed. This page uses the load ratings in catalog G99TE24-2410; the HIWIN US website quotes 13.88 to 108.72 kN for QH, so confirm the rating basis of your calculation. Confirm size, block type, preload, accuracy, rail length and E values before ordering.

Installing the QHH block and rail

The accuracy of the finished axis depends as much on the mounting surfaces as on the guideway itself. Machine the rail and block seats flat and clean, remove burrs, and wipe away chips and rust-preventive oil before assembly. Push the rail against its reference shoulder and tighten the rail bolts in sequence from the middle towards the ends, using the torque values HIWIN gives for the chosen size. Keep the block on its mounting aid until it is transferred onto the rail, because a block pushed off an unsupported rail end can lose balls and partitions that are hard to recover. When two rails run in parallel, fix the master rail first, then align the second rail to it with the table mounted lightly before tightening everything fully.

Lubrication and running-in

The SynchMotion partitions hold lubricant and reduce how often the block needs attention, but they do not remove the need for it altogether. Lubricate the block before first use as the catalog describes, run the axis through its full stroke several times to spread the grease, and set a relubrication interval from stroke, speed and contamination rather than from the calendar alone. Where the E2 self-lubrication option is fitted, check it as part of routine inspection. Listen to the axis: quiet running is the main reason for choosing a QH block, so a rise in running noise is an early sign that lubrication, alignment or contamination needs attention.

Dust, sand and heat in Omani workshops

Factories and workshops in Oman often have fine airborne dust and sand, especially near open loading bays and at desert sites. Abrasive particles shorten guideway life far faster than load does, so match the dust protection to the machine: the standard end and bottom seals for clean, enclosed axes, and the ZZ, KK or DD arrangements or the RC reinforced cap for dirtier environments. Bellows or telescopic covers over the rail add a further barrier. High summer temperatures can thin grease and speed its loss from the block, so check lubrication more often in the hot months, and store spare blocks and rails sealed in their packaging with rust protection, particularly at coastal plants.

Checks before finalising the selection

Work out the equivalent load on each block from the real moving mass, acceleration and moment loads, and compare it with the C rating of the chosen size on the same rating basis. Check that the block height and width fit the machine envelope using the dimension table above, that the rail length covers the stroke plus block length and end clearance, and that the preload class balances rigidity against running friction. Finally, decide whether interchangeable parts or a matched set is needed, as this determines which accuracy and preload classes are available.

Documents and quotation

The linked PDF is the QH chapter of the HIWIN Linear Guideway Catalog G99TE24-2410, unchanged. More items are in our product range. Seven Star LLC is an independent supplier in Muscat; send the QH model number, rail length, quantity and delivery location with your RFQ.