brian Posted January 14, 2008 Share Posted January 14, 2008 Can ye learned gentlemen (or ladies) tell me how far the shaft would travel vertically on a fly press at one revolution of the screw. Know there are all sizes so not a huge industrial press just a one man press used for general blacksmithing.:confused: Quote Link to comment Share on other sites More sharing options...
Paragon Posted January 14, 2008 Share Posted January 14, 2008 I know nothing about them but.. Wouldn't it matter on the tpi (threads per inch) of the screw? The more travel per rotation (courser the threads = smaller tpi) the less force you will get as opposed to a press with finer threads (less travel per rotation) If you look at pictures.. the distance of press travel on a rotation will be the distance from one thread to the next.. I'l say from center of the thread to the next. You can look at pics and get a relative idea from that. Quote Link to comment Share on other sites More sharing options...
nonjic Posted January 14, 2008 Share Posted January 14, 2008 brian - I only use one for puching heavy gaskets now, but from memory about 1/4 turn ( a gentle swing on it) gives maybee 1/4 ram travel - someone smarter than me could give you the maths im sure thinking on that would make it a 1" pitch thread. This is on a little 'Sweeny & Blocksage' Quote Link to comment Share on other sites More sharing options...
habu68 Posted January 15, 2008 Share Posted January 15, 2008 There are more than one tread that wind around the shaft this increases the pitch and makes the vertical travel faster than the rotational travel. This is called a 2 , 3, or 4 lead screw. A 4 lead fly press is best for blacksmithing as it gives the fastest travel. these threads are also called multiple start threads. CNC Tech Talk - Dealing With Multiple Start Threads On Turning Centers - 02/06 2 start threads are commonly found on the screws for garage door openers and on some wood working vises. 3 and 4 starts a much less common and are a good "test" for a machinist. Remember you must be able to turn a nut to match. Quote Link to comment Share on other sites More sharing options...
Blacksmith Jim Posted January 15, 2008 Share Posted January 15, 2008 ... A 4 lead fly press is best for blacksmithing as it gives the fastest travel and from what I've heard, that is a difficult thing to machine. Most machinists don't have a need to cut threads like that. Therefore they end up a little hard to find, or so I've been told anyway.. Quote Link to comment Share on other sites More sharing options...
Paragon Posted January 15, 2008 Share Posted January 15, 2008 There are more than one tread that wind around the shaft this increases the pitch and makes the vertical travel faster than the rotational travel. This is called a 2 , 3, or 4 lead screw. A 4 lead fly press is best for blacksmithing as it gives the fastest travel. these threads are also called multiple start threads. CNC Tech Talk - Dealing With Multiple Start Threads On Turning Centers - 02/06 2 start threads are commonly found on the screws for garage door openers and on some wood working vises. 3 and 4 starts a much less common and are a good "test" for a machinist. Remember you must be able to turn a nut to match. Yeah.. when I said I knew nothing about flypresses.. I meant it That would make sense. I totally forgot about that multi threading. Would make sense as some of the pics I have seen have has some interesing threading. Quote Link to comment Share on other sites More sharing options...
habu68 Posted January 15, 2008 Share Posted January 15, 2008 Flypress and tooling - Blacksmith Picture Gallery in this photo every 4th thread is a single lead so you can see how far a single turn of a flywheel will move the tool.. Note the tooling. Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted January 15, 2008 Share Posted January 15, 2008 I have a 2 lead screw press and can check how much travel it gets per rotation; but it will be a couple of days as I get home late today and tomorrow and a cold dark shop is not very inviting late at night. Quote Link to comment Share on other sites More sharing options...
nonjic Posted January 17, 2008 Share Posted January 17, 2008 Checked my little sweeny & blocksage, and the ram travel is approx 2" per full rev of the screw - (well, I measured approx 1/4", over 1/4 turn, and you rarely use more than a big quarter turn, as you end up in knots !) - I got some pics of the screw on my phone, Ill post em soon. Quote Link to comment Share on other sites More sharing options...
nonjic Posted January 17, 2008 Share Posted January 17, 2008 Heres the snap of the thread on the small press, hope it helps some... Quote Link to comment Share on other sites More sharing options...
ThomasPowers Posted January 22, 2008 Share Posted January 22, 2008 I measured mine yesterday, I have a 2 lead screw press and it travels 1 and 5/8" per full turn of the screw. Quote Link to comment Share on other sites More sharing options...
nonjic Posted January 22, 2008 Share Posted January 22, 2008 (well, I measured approx 1/4", over 1/4 turn, and you rarely use more than a big quarter turn, as you end up in knots !) - I got some pics of the screw on my phone, Ill post em soon. no one noticed my delibreate mistake on this one then..... :rolleyes: I meant 1/2" per quater turn...... o o o o p p p p s. Quote Link to comment Share on other sites More sharing options...
brian Posted January 23, 2008 Author Share Posted January 23, 2008 no one noticed my delibreate mistake on this one then..... :rolleyes: I meant 1/2" per quater turn...... o o o o p p p p s. Look forward to the photo's. Hey,do you remember when phone's were something you cranked a handle on and spoke to people !!!! Amazing. Quote Link to comment Share on other sites More sharing options...
nonjic Posted January 23, 2008 Share Posted January 23, 2008 brian , click back to page 1 of this thread, I posted a picture of the screw from the small sweeny & blocksage, with a steel rule next to it. Hope this helps some. ps, dont remember the old phones, im 32 :) Quote Link to comment Share on other sites More sharing options...
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