The Pistorius VN-B (WB) underpinner is a RED tool requiring training and authorization before use (Frame Shop Red Tool class).
The Pistorius VN-B (commonly referred to as the WB) is a highly durable, pneumatic V-nailer and underpinner used by custom picture framers to seamlessly join frame corners. Manufactured by the legacy Pistorius Machine Co., these vintage, heavy-duty machines are highly sought after on the used market for their reliable, "built-like-a-tank" construction.
Essential Maintenance Tips
Because these machines are no longer in active production, keeping a used VN-B unit in prime working condition requires adherence to routine pneumatics maintenance:
- Prevent Foot Pedal Air Leaks: A common issue with older or long-sitting VN-B units is air continuously releasing from the foot pedal. This is typically caused by dried-out internal O-rings. Introducing a few drops of lightweight pneumatic tool oil directly into the incoming air line inlet can safely lubricate the seals and halt the leak.
- Daily Lubrication: Add 4 to 5 drops of lightweight machine oil directly into the oiling hole located on top of the driver guide before heavy production runs to keep the firing pin cycling smoothly.
- Filter-Regulator Setup: Ensure the machine is hooked to a clean, dry air line with a structural baseline of at least 3/8" ID air line piping, complete with a lubricator cup adjusted to drip oil roughly once every minute during operation.