Minigraf 4 underpinner not driving in wedges fully.

[woodman-46]

Hello,
I have a Minigraf 4 underpinner that has served me well. Recently I changed the wedge hammer / piston unit because the old one was about ten years old. It was beginning to not drive wedges in fully. The new hammer is much better but the wedges are still not driving in fully. I have the bar pressure up to about 5.5 and don't want to go further in case of damaging the polycore moulding.
Does anyone have any advice to rectify this.
Thanks

 

[Paul Cascio]

There are a number of issues that could result in the nails (wedges) not going all the way into the moulding:
1. Are the nails upside-down in the machine? Correct nails for material being joined?
2. Is more air pressure needed. I wouldn't worry too much about raising the pressure a little. Do it in small amounts if you're concerned, and try a test piece.
3. Is the top clamp not low enough, or loose?

 

[Jim Miller]

How often do you inject pneumatic tool lubricant into the air-input port?