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17th Sep 2012, 10:16 AM #1.
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The Design and Mechanics of Cam Type Locking Devices.
Ray asked me a question about cam eccentrics in my swivel base thread. I confessed to simply copying an original part. I have a few books on fixture design so to provide a more detailed response to Ray's question, here are a few pages from the books.
BT
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17th Sep 2012, 11:09 AM #2
Thank you for posting this Bob,
I have often wondered how cams hold so well, especially ones like you have made. I have just never gotten to researching them.1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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17th Sep 2012, 04:21 PM #3
Hi BT,
Thanks for the the elaboration and the pictures...
I think I'll have to draw a few careful diagrams to understand the difference between eccentric cams and spiral cams, I think there is a relationship between locking tapers and eccentric cams, but it's a little more complex with spirals and overcenter locking,
I just bought a copy of the Frank Wilson book on abebooks for $2.52 plus postage...
Regards
Ray
PS Here's a signed first edition of a later Frank Wilson Book on Fixtures..
Handbook of Fixture Design: a Practical Reference Book of Workholding Principles and Design for All Classes of Machining, Assembly, and Inspection, 1st Edition by Holt John M Wilson Frank W: McGraw-Hill Signed by Author(s) - Wonder Book
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17th Sep 2012, 04:36 PM #4.
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I don't know if reading would have avoided my latest close shave Ray. I only hope that by my example () others may avoid similar pitfalls.
BT
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18th Sep 2012, 12:44 AM #5Diamond Member
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Good evening All, further to Rays note that Wilsons book is available from Abe Books, Coles book is also available from these guys for $8 U.S. + postage. If you scroll down near the bottom of the page you will find it, a second or reprint edition of 1942, if my short term memory hasn't failed me. Much cheaper for both these books than the offerings from Amazon if you do a search for tooling or jig design.
BT or anyone else for that matter with an opinion on the matter, is either of these books better than the other, from the point of a complete new chum to this topic. Are they both equally readable? Thanks for your opinions,
Rob.
PS. Thanks BT for posting on this topic and bringing a hither to unknown topic to my attention. MMmmmmm so much knowledge to acquire, and so little time. RG.
Dowd's Tools - Books and Paper Goods
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18th Sep 2012, 12:08 PM #6.
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Rob,
I'd say the Wilson book is the most informative, but if you could buy both cheap enough then why not have both. They aren't books I pore over, I tend to look at photographic images on the net and in my catalogues for "inspiration". There is another book that may be of interest. Titled " Mechanisms, Linkages and Mechanical Controls", the book contains numerous readily understandable diagrams rather than the working drawings, sections etc. found in the other two books. I'm sure I posted some details of the book in a response to some questions asked by Bryan a couple of years ago. I had a boy's look for the post but came up empty handed.
Here are some blurry photos.
BT
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18th Sep 2012, 03:50 PM #7Diamond Member
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Thanks Bob for the reply, I will chase it up in a couple of weeks, as I will not have much if any net access for a week to ten days starting from tomorrow.
Rob.
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