Need Help PC 7336

2

215Detailing

New member
Wanting to use a 3.5/4 inch backing plate & pad combo for PC 7336 I have a 6 inch counterweight on PC Now, What is proper way to go into 4 inch pad use, is their a replacable smaller counterweight or do I remove 6 inch counterweight all together without damage to PC?
 
Counterweights

The counterweight is to balance the rotational forces from the eccentric (orbital) rotation of the machine, as an unbalanced force will cause unnecessary vibration, which may cause undue bearing and motor wear The counterweight is a half-moon shaped piece of metal attached to the rotating shaft of the tool, this smoothes out the random orbit action by providing a counter balance to the elliptical orbit of the rotating backing pad. If you change the backing plate size you must also change the counterweight or suffer unnecessary vibration and possible damage to the tool. Counterweights are attached with two Torx fasteners; size T15.

These machines (both the 7424 and the 7336) were originally designed as sander / polishers and the counter weight was designed to balance the centrifugal force of a single sheer of Velcro? backed sandpaper. For all intents and purposes the counter weights have no real relevance when using a foam pad and its backing plate


An extract from one of a series of in-depth detailing articles ? TOGWT ? Ltd Copyright 2002-2008, all rights reserved ​
 
I have never changed the counter weight on mine and use 4-inch pads exclusively on my PC 7336
 
I just bought a 3.5" BP with my 7336 and never even gave the counterweight a thought. I agree with the others that it should not be an issue.
 
215Detailing said:
Thanks for your input plan on using more 4 inch pads in the future as well as 7.5 recessed pads
Click to expand...

I would consider using 6.5 inch pads instead. The 7.5 inch, because of its mushroom design has a similar contact area (friction) but it is harder, IME, to work it into tight areas. Also the pad is heavier which will slow the motion of the machine.
 
TOGWT said:
Counterweights

The counterweight is to balance the rotational forces from the eccentric (orbital) rotation of the machine, as an unbalanced force will cause unnecessary vibration, which may cause undue bearing and motor wear The counterweight is a half-moon shaped piece of metal attached to the rotating shaft of the tool, this smoothes out the random orbit action by providing a counter balance to the elliptical orbit of the rotating backing pad. If you change the backing plate size you must also change the counterweight or suffer unnecessary vibration and possible damage to the tool. Counterweights are attached with two Torx fasteners; size T15.

These machines (both the 7424 and the 7336) were originally designed as sander / polishers and the counter weight was designed to balance the centrifugal force of a single sheer of Velcro? backed sandpaper. For all intents and purposes the counter weights have no real relevance when using a foam pad and its backing plate


An extract from one of a series of in-depth detailing articles ? TOGWT ? Ltd Copyright 2002-2008, all rights reserved ​
Click to expand...

So people read eccentric to mean ellipitical, which in this case would be wrong. Just for clarification, the orbiting motion of the Porter Cable is circular.
 
[Just for clarification, the orbiting motion of the Porter Cable is circular.]

I'll put the difference down to American english vs English, circular motion is mesured as RPM and would not be an eccentric, an orbiting motion is mesured in OPM and is eccentric due to the 'throw' -samantics
 
You must log in or register to reply here.
Back
Top