Thread: my build
i am looking at this page http://www.ondrives.com/commercial-g...ype-steel.html looking down the mod column it relates to the width of the rack, the pitch line is down from the top of the tooth so measured down there i could have mod 1.5 .... i think .... maybe .....well i am getting confused with this
Not sure why they've measured P based on the height, but that could be where they're measuring from (I am doing this from memory).
I've got some mod 1.0 rack in the garage - I'll go and measure it - it should tally with what they've got.
Just measured it - it's 3.15ish mm, so I'm willing to go with 3.14.
Looking at this page (which I'd been to earlier):
it sort of indicates that half the pitch is (pi * m / 2) - although the end marker isn't exactly where I would expect it.
ETA: Looking at Kn8's document - reference pitch is pi * m, which is what I thought it was all along.
The "P" is the reference pitch height - i.e. where you measure the pitch from.
will go and get the calipers to measure the rack
Just had a thought about the meaning of the "P" value - this is actually the height at which the pitch diameter would ride at.
So, if you had a 60mm diameter gear, and "P" was 10mm, then the centre of the gear would be 40mm from the base of the rack.
get 11mm pitch 3.1mm at the crown of the tooth
and rack is 12mm wide , i am still confused cant seem to find anything similar, unless im measuring at the wrong place
Going from crown to crown, then 11mm is near as damn it mod 3.5. However, I've not seen that many mod 3.5s.
This seems to indicate this company makes them: http://www.rushgears.com/Tech_Tools/geargages.php
I take it you didn't find any gears with it, did you...
tribbles yes you'r right it looks like mod 3.5
no, no gears with it im afraid
mod 3.5 looks hard to find
v groove bearings arrived from ebay this morning, the t slots on the back of the beam just happen to be size for a 10mm bolt head...
the x and y are rock solid much better than my first mdf creation
apparently this ali beam came from a stenna stair lift 190mm x 90 no flex at all even after cutting out the middle section . screw will go through the middle of the beam , gives me 600mm on the y
new trend t4 coming from santa for spindle...
BUILD LOG: New Build - For Your Amusement - MK-2 buildBy Karl in forum DIY Router Build LogsReplies: 11Last Post: 11-06-2012, 07:34 PM