Festool 493566 Guide Bushing Adapter for OF-1400

[richkline]

Hi,

I have the Festool 493566 Guide Bushing Adapter for my OF-1400.  After reviewing a number of posts, I still have a question.  I have two different Whiteside guide bushings that are 1 3/16 and fit upside down perfectly.  But pushing the threads through was at first a non-starter.  After just deciding I'm going to REALLY push, I was able to rock them into position.  It then took a dead blow hammer to get them out.  Is this tight tolerance what other people are seeing.  Will the standard Porter Cable be a little looser fit and easier in and out.  I get you need to be tight but the outer collar should handle that part and the threads shouldn't be damaged going through the Festool guide bushing

Am I doing something wrong?

Thanks,
Rich

 

[flair woodworks]

Assuming you are not putting the parts together at a severe angle, something is wrong with the sizes.  I have never had to use force to get guide rings into the OF 1400 guide bushing adapter.

 

[Sparktrician]

Given how precisely Whiteside machines their bushings, I'd be suspect of the stamped Festool adapter.  Can you test the bushing with another adapter at the dealership? 

 

[xedos]

The OF1400 guide bush system is hit or miss.  If yours is a miss it sucks, cause there is no adjustment.

 

[richkline]

It's a miss, I bought a set of the Porter Cable bushings and they fit (with some play).  The Whiteside ones were so tight that I need a hammer to get it out.  Dwayne at Slabstitcher double checked and also figured out that some 220 sand paper on the threads of the Whiteside bushing was a solution because he experienced the same problem.

Thanks,
Rich

 

[Cheese]

I just measured mine:

Whiteside inlay bushing 1.1865"/1.1875" OD.

Porter Cable bushing 1.1785"/1.1795" OD.

Festool guide bushing adapter 1.1825"/1.1845" ID.

So, the Whiteside OD is .004" larger than the Festool ID and the Porter Cable OD is .004" smaller than the Festool ID.

 

[richkline]

This community rocks.  [member=44099]Cheese[/member] it was described to me as likely a function of metric to imperial rounding or conversion.

 

[Cheese]

This community rocks.  [member=44099]Cheese[/member] it was described to me as likely a function of metric to imperial rounding or conversion.

Ya Rich that could be, however if you pull up the specs for a 1 3/16-20 UN thread, the max major diameter for a class 3A thread is 1.1875", while the max major diameter for a class 2A thread is 1.1861".

The bore on the Festool adapter varies between 1.1845" to 1.1825", so that even a class 2A thread at the max major diameter would be too large.  [eek]

I think Festool probably just grabbed some Porter Cable bushings and designed their adapter around them figuring they were probably the most universally used bushing on the market.
However, Whiteside being a machine shop first and focused on precision, decided to use the specs of a class 3A thread for a nice tight fit.