PCD of 5 1/2" 1909 / 10 Wheel Hubs

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2014: PCD of 5 1/2" 1909 / 10 Wheel Hubs
Top of pagePrevious messageNext messageBottom of page Link to this message  By Alan George Long on Thursday, December 04, 2014 - 12:14 am:

Can anyone tell me if the wheel PCD of the 6 hub bolt holes are the same for the (09/10) 5 1/2" and 6"Diameter Hubs as fitted to the later years.

I would imagine that the 6"Diameter Hubs had a larger PCD than the 5.5"Daimeter?? If so, what is the smaller PCD??

Thanks. Alan in Western Australia


Top of pagePrevious messageNext messageBottom of page Link to this message  By Herb Iffrig on Thursday, December 04, 2014 - 08:18 am:

What is PCD?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Tom Miller, Mostly in Dearborn on Thursday, December 04, 2014 - 09:41 am:

Pitch Circle Diameter?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Andrew Brand on Thursday, December 04, 2014 - 03:26 pm:

Yes, pitch circle diameter. I hadn't heard the term until recently when I was looking for a trailer spare. Its a way of determining the bolt pattern by measuring the distance between adjacent bolts.

Alan, I can't tell you a measurement right now, but the PCD for 5 1/2" hubs is smaller than the PCD for 6" hubs. You would have to re-drill the hub bolt holes to put a later hub in a 1909-10 wheel, or vice versa.

You can tell a 1909-10 wheel with a 6" hub in it because the outer diameter of the hub and flange covers the joint between the spoke shoulders. In other words, the distance from the rim to the spoke shoulder is longer on a 1909-10 wheel than on a 1911 + wheel.

Andrew


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jerry VanOoteghem on Thursday, December 04, 2014 - 04:44 pm:

Pitch Circle Diameter sounds like gear terminology. Usually you speak of bolt hole patterns in terms of B.C., Bolt Circle. But maybe the verbiage is different in Australia.

Cheers!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dennis Seth - Ohio on Thursday, December 04, 2014 - 04:57 pm:

Thank heavens you guys cleared up what PCD is. I thought it stood for Perth Cop in Drag!


Top of pagePrevious messageNext messageBottom of page Link to this message  By Don Skille on Thursday, December 04, 2014 - 06:32 pm:

The 5 1/2" hub has 5/16 bolts and they 4 1/2" between centers.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Don Skille on Thursday, December 04, 2014 - 06:39 pm:

The 5 1/2" hub has 5/16" bolts and they are 4 1/2" between centers.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Darren J Wallace on Thursday, December 04, 2014 - 10:40 pm:

PCD is widely used in the UK, and in Canada too. Machinists here in Canada still use both terms, B.C. and PCD....just like using inches AND millimeters :-)


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration