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Model Forum / General / Models / November 2006'Nother tricky thread
On the subject of tricky threads, does anyone now how to calculate the thread form used in a Quimby pump? It's two threads which mesh, one right handed and one left handed, as in http://www.animatedsoftware.com/elearning/All%20About%20Pumps/glossary/aap_g lossary.swf Ta,  SignaturePeter Fairbrother I've had a go at it and sent Peter a document showing how I did it. Anyone else had a go? Henry Ok then I 'tried' to send a document! "You can't do that there 'ere" was the result. Henry > Ok then I 'tried' to send a document! > "You can't do that there 'ere" was the result. > > Henry My email address is good, and unfiltered-by-isp (though full of spam and the occasional virus or worm) - you should be able to send me anything as a simple attachment to an email. SignaturePeter Fairbrother Peter, The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'zenadsl6186@zen.co.uk'. Subject 'Re: 'Nother tricky thread', Account: 'NTL World Mail', Server: 'smtp.ntlworld.com', Protocol: SMTP, Server Response: '550 you are not allowed to send mail to <zenadsl6186@zen.co.uk>', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79 The above is what I get when trying to send to you The message remains in my Outbox Anyone care to explain? Using Outlook Express. I'm having second thoughts about my solution. Started with square sectioned threads on both screws. Decided that they clashed and thinned them until they didn't. No sure about the clash now. Henry > Peter, > [quoted text clipped - 9 lines] > Anyone care to explain? > Using Outlook Express. The 550 error is because the NTL mail server does not recognise you as a valid sender - perhaps your "from" address is faked? If you are using a faked trapbait "from" address, it will not be recognised by your mail server. > I'm having second thoughts about my solution. > Started with square sectioned threads on both screws. > Decided that they clashed and thinned them until they didn't. > No sure about the clash now. They clash all right. I think the form edges have to be angled to account for the angle of threading, somehow... SignaturePeter Fairbrother Wandering a bit OT here, but it may be of general interest: xxx wrote privately: > Peter Fairbrother wrote: >> The 550 error is because the NTL mail server does not recognise you as a >> valid sender - perhaps your "from" address is faked? If you are using a >> faked trapbait "from" address, it will not be recognised by your mail >> server. > Spot on with the explanation of failure. > Doesn't complain when I send to the group however! Sending to a group you will be sending to a news server, probably called something like news.ntl.com or nntp.ntl.com, rather than to a SMTP (for outgoing mail) server, probably called smtp.ntl.com. There will also be a POP server for when you collect incoming mail, probably called pop.ntl.com. SMPT servers are usually much more fussy than news servers about who they will accept emails from - mainly in order to lock customers in to an ISP. ( The ISP provides the email address, and you can only send email with that "from" address - so "your" email address is not under your control, and consequently you will have the hassle of telling everyone your email address has changed if you want to change ISP. Some people may say that it is to do with anti-spam measures, but that is baloney, it would be easy and almost free for an ISP to set it's SMPT server to allow email with say five authenticated "from" addresses per customer - addresses which the customer has control of, not the ISP - but they don't do that.. ) SignaturePeter Fairbrother Got my knickers in a twist in my original attempt to draw the Quimby pump screws. Perhaps that should be got my knickers in a helix. Had another go and realised that left and right hand screws will mesh not interfere. Have sent Peter my shot at drawing something like the illustration So the whole thing is perhaps a gear pump using helical gears. If so any symmetrical profile will do provided the screws are driven by gears on their ends. Perhaps with 'proper' profiles one can be driven from the end and will drive the other one. It would be nice to know what the actual machines look like inside. Henry |
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