Troubleshooting overlapping on veneer splicer

Photo By Diehl Machines

Following are some tips to resolve overlapping problems on a veneer splicer.

Problem: The edge of one piece of veneer is on top of the other. The veneer is not being held flat.

Possible causes/tips: 1) The pressure bar may be too high: Check the float gauge. Lower the pressure bar.

2) The front suspension bolt is too tight. This lifts the infeed end of the upper heater bar: Loosen the suspension bolt.

3) Upper heater bar is too high: Reset the upper heater bar.

4) The front end of the heater strip is not against the lower heater bar: Place a slight bend in the heater strip 4 inches from the infeed end.

5) The heater strip will not “float” up and down at the infeed end: Check the lower heater bar for level. The feed chains are pulling on the heater strip.

6) The pressure setting is too light. Check for pressure marks, the shine, on the veneer: Increase the pressure setting.

Problem: The veneer overlaps before entering the feed chains.

Possible causes/tips 1) The holddown springs on the matching roll are not holding the veneer flat: Lower the holddown assembly. Replace the holddown split springs.

2) The matching rolls pull the veneer into the machine at angles: Readjust the cant on the matching rolls. Reduce the pressure on the matching rolls.

3) The edge of the veneer curls up against the infeed guide: Readjust the cant on the matching rolls. If the veneer is curled at the edge set the holddown block as close to the matching roll and as low as possible.

4) The jointed edges of the veneer are not square: Check the jointer blade for sharpness. Only use the veneer edge from the flat side of the Guillotine.

Problem: The veneer overlaps on one or both ends only 

Possible causes/tips: the edges of the veneer are not straight or parallel. Check the jointer.

Source: Diehl Machines, a division of Mereen-Johnson. For information on Diehl Machines call 260-563-2102 or visit  For information on Mereen-Johnson call 612-529-7791 or visit


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