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Thread: drill press vice woes
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17th May 2011, 07:29 PM #1
drill press vice woes
Again this week I have had to repair the chinese sourced cast iron drill press vice.The cherubs that don't know or care, have drilled into the base and weakened it.
If not repaired ( by brazing it up) the drill press is likely to crack through the drill press andbreak & become useless.
I have found this plan at
Drill press vise plan | free-projects
I intend to scale it up to use the 25mm th plate I have as scrap off cuts to use as the jaws and threaded push plate..
Is it feasable to fold the push plate (virtually the female threaded nut) and cut an acme type thread in the 4 jaw.
My research tells me the thing to do will be to cut the male thread and match the nut to it.
Are there any pearls of,cutting acme thread, wisdom those experienced in such black arts, would care to offer?
I surmise that if I make it in steel that repairs to the base plate can be easily made by welding and then dressed.
Indeed most high schools must have the same problem but I am unaware of any steel versions on the market so I may have some potential sales
Grahame
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17th May 2011, 08:28 PM #2GOLD MEMBER
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If your not sure of your ability to cut the ACME thread you maybe better off with either a VEE form or Square.
You would in my opinion find either of these much easier to cut than the ACME.
Just looked at the drawing and they have asked for a 16x4 trapazoidal thread.Last edited by pipeclay; 17th May 2011 at 08:32 PM. Reason: more info
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17th May 2011, 09:08 PM #3
Have a look at this link. 5/8 - 8 Right Hand Acme Lead Screws & Nuts for Power Transmission - Roton Products, Inc.. $7.07 per foot plus postage may be worth looking at for 5/8 inch Acme threaded rod. This is precision rolled thread, not that you need it for a vice. Also look at nuts. Numerous types are available to suit.
I found this information looking for left hand 5/8 thread to repair a worn cross slide screw for a lathe. Only a fraction of the cost of the cheapest price in Australia.
Dean
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17th May 2011, 11:17 PM #4
I had to screwcut an Acme thread for my Simplex loco. The thread was .25" OD and left handed. The nut was also screwcut to fit. The total length of the shaft was about 2.75". The thread was no more difficult to cut than a normal 60 deg. thread. I swung the toolpost around to half the thread angle which allowed me to feed down the side flank of the thread. It wasn't a great challenge but it was fun to do. Machining on the lathe only becomes hard when you con yourself into believing it will be. I taught all my students that if you can fit it in the lathe and swing it, then the hard part is done. Machining the part is then easy.
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18th May 2011, 12:22 AM #5Senior Member
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I made a small vise and just used a regular thread on the rod. I can't tell the difference when using it...Bob
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18th May 2011, 04:54 AM #6Senior Member
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Even my top of the line Palgram Vise has regular screw threads on it...Bob
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18th May 2011, 08:56 PM #7Senior Member
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I made something like that years ago and used the thread and nut from an old scissor type car jack, perfect for the job and it didn't cost me anything.
Regards
Bradford
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18th May 2011, 10:50 PM #8Dave J Guest
I also read a web page years ago where a guy in Aus used the scissor jack thread for his extended compound he made for his lathe.
Making an AL340 Lathe Compound Slide
Dave
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18th May 2011, 10:54 PM #9
Hey! I really like that.
Its outside of the box thinking and saving resources as well.
It appears I don't know squat about those types of threads.
I still want to learn about turning these threads and will have a go regardless.
But metalmaster has solved the immediate problem which is replacing a vice on the second drill press,I'll go with the 16 x 2 mm which I am already tooled for.
Bradford ,I'm on my way to the resources centre on the weekend for the scissor jack but will continue on from that and get a bit of bright steel and turna proper -( what ever its called thread) butress,square acme - picks easiest one
Thank you one and all friends
Grahame
Thank you
Grahame
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20th May 2011, 02:18 AM #10Senior Member
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There not that harder at all to cut usually When making the nut you will undercut at the start of the nut to the diameter that is needed to give you a guide on depth, just try and work out the calculations to give you an idea as you cut the nut depth a fair but more than the diameter of the bolt
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