# PC 690 - Diameter of Guide Rods?

4473 Views 17 Replies 8 Participants Last post by  Stick486
Could someone tell me the diameter of the Guide Rods used for the edge guide on a PC 690? I want to order some longer rods, than what comes with the edge guide, to build a circle cutting jig. And no, I don't have an edge guide to use as a reference. I've measured the mounting hole and I thought it was going to be 3/8" but it appears to be significantly larger than that.

Dave.
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5/16''
But, but, but...David said it appeared to be LARGER than 3/8". (3/8"+)
For our metric friends, 3/8" is the the same as 6/16". Stick measured his at 5/16"...somebody's mistaken.
But, but, but...David said it appeared to be LARGER than 3/8". (3/8"+)
For our metric friends, 3/8" is the the same as 6/16". Stick measured his at 5/16"...somebody's mistaken.

"New Math"...:grin:
2
In a recent thread, I had occasion to measure my old Craftsman guide rods at 1/4" ...ie 4/16". I didn't actually measure my Bosch guide rods but they're massive by comparison.
But, but, but...David said it appeared to be LARGER than 3/8". (3/8"+)
For our metric friends, 3/8" is the the same as 6/16". Stick measured his at 5/16"...somebody's mistaken.
plan ''A''...
insert rod into hole gauge...

plan ''B''...
Have David insert a drill bit that fits the hole...
read size on drill bit to learn the size of the hole...

anything else I can do for ya Dan...
3
But, but, but...David said it appeared to be LARGER than 3/8". (3/8"+)
For our metric friends, 3/8" is the the same as 6/16". Stick measured his at 5/16"...somebody's mistaken.
just so ya know...
the hole size is 13/32'' or 26/64 in metric...

suspect the guide is for more than just the 690...
in metric - that would be ''one size fits all''...

Bosch has two sized rods depending on year and model...
3/8'' (6/16 metric) and 7/16'' (21/48 metric)...
older than dirt Bosch had 1/2'' rods (50/100 metric)...
You beat me to it...I went out and measured my Bosch rods.... .373" (3/8" or 6/16")
They'd probably fit David's PC.
You beat me to it...I went out and measured my Bosch rods.... .373" (3/8" or 6/16")
They'd probably fit David's PC.
the Bosch I knew...
I added 5 and 10' rods for the Bosch guide...
Don't know what size but there is a Type 1 and a Type 2 PC 690 so that will probably make a difference. Do you have a caliper?
I just realized that I could use my drill bits to find the right size. It turns out that I was way over with 3/8". My eyeball must be getting out of calibration. I found that a 9/32" drill bit fits just right. Thanks for the help.
Dave.
2
So, a 1/4" rod is perfect, a little slop (1/32") isn't a big deal; there's two rods to keep it in alignment.
I hope you guys have prescriptions for those Metric drugs ! LOL
3
But, but, but...David said it appeared to be LARGER than 3/8". (3/8"+)
For our metric friends, 3/8" is the the same as 6/16". Stick measured his at 5/16"...somebody's mistaken.
Hey Dan, if this was a conversion to metric, shouldn't it be in millimetres? Metric doesn't do fractions.
2
Not On My Watch!

Hey Dan, if this was a conversion to metric, shouldn't it be in millimetres? Metric doesn't do fractions.
No conversion; a translation for our Imperial fractions challenged friends.
3
No conversion; a translation for our Imperial fractions challenged friends.
Here we are going again...
Here we are going again...
for medicinal purposes only..
or entertainment...
1
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