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METRIC TRAPEZOIDAL THREAD DIMENSIONS. ISO metric trapezoidal thread profile is a thread form with 30° angle of thread which is used for lead screws (power screws). Dimensions and tolerances for metric trapezoidal screw threads are defined in ISO 2901:1993, ISO 2902:1977, ISO 2903:1993 and ISO 2904:1977 standards.
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Metric bridgeport leadscrews - acme or trapezoidal?
Hi all,
Hello from Melbourne, Quarterly report. This is definitely my 1st posting in this forum. I've happen to be looking for a BP for some time right now that wasn't a foolish price and wasn't 1000+ klms away. I lately scored a 'not really functioning, condition unidentified' 1981 BP from public sale. Turns out the main belt had been broken so I had been lucky now there. Even so it is definitely getting a total teardown and refurb where required (and inexpensive). Top end repair package from HM will be on the listing.
The machine is certainly metric with 5mmichael message leadscrews. The metric nut products are foolish prices so I'll probably make them.
Does anyone understand if the stock 5mmeters message leadscrews are 29deg acme or are usually really 30deg trapezoidal?
Faltering actually understanding that I feel guessing grinding a threading device to match up an unworn part of a screw is certainly a great, if probably inexact, solution.
Numerous thanks,
Greg. - Titanium
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Great question.I have a Taiwan Chinese metric BP duplicate. I'll be viewing this thread, but I don't think it will make a distinction either method.Originally Published byStrayAlienHi there all,
Hello from Melbourne, Sydney. This can be my initial post in this forum. I've been searching for a BP for some time right now that wasn't a silly price and wasn'testosterone levels 1000+ klms apart. I lately obtained a 'not really functioning, condition unknown' 1981 BP from auction. Transforms out the main belt has been broken so I was lucky now there. Nonetheless it is usually obtaining a complete teardown and refurb where required (and inexpensive). Best end reconstruct kit from HM is certainly on the list.
The device is metric with 5mm message leadscrews. The metric nut products are foolish prices therefore I'll most likely create them.
Does anyone know if the share 5mmichael presentation leadscrews are 29deg acme or are really 30deg trapezoidal?
Failing actually knowing that I are guessing milling a threading device to fit an unworn part of a screw is certainly a great, if maybe inexact, remedy.
Numerous thanks a lot,
Greg. - Metal
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Greg,
Are usually you reusing the existing leadscrew, or have got you discovered spares at a decent cost? If you are in the circumstances of replacing the nut products, possibly the anchoring screws don't appear much much better and you'd end up being much better off purchasing good high quality trapezoidal screws and complementing nut products, sleeve the new one to fit the holder, and graft the fresh leadscrew to the end of the aged one, unless you can model it to correct profile.
Paolo - Diamond
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AFAIK, metric machines were not an option in the 80s for the US machines. I'm going to wager that you have got a UK built device. I'michael reasonably certain they had been all DIN compliant leadscrews, IE snare 30.Initially Published byStrayAlienWill anyone understand if the stock 5mmichael frequency leadscrews are usually 29deg acme or are really 30deg trapezoidal?
There might become a resource in the British for nuts. If not really, there's a business oppurtunity.
Junior - Throw Iron
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Paolo, thanks a lot. I'll become use the present screw. Replacing the nuts is even more of a 'even though I have it apart' issue. It'll get a DRO simply because well.
JR - thanks a lot. Yes, it is definitely a UK machine. Thoughts, I bought it considering it was a All of us machine (it doesn't possess the large 'Adcock Shipley' team into the ram memory and furthermore has the smaller sized US style power cupboard).
Re standards conformity, I type of thought that might become the situation, but mainly because very long as the pitch is certainly metric it doesn't really matter, so my reasoning was the exact same tooling could end up being used to create either metric or imperial. I presently possess a taiwanese mill that is usually an oddball of some parts getting metric and some components normally - even down to the bolts used to suspend it jointly). But trap 30deg makes sense for a 'proper' metric machine.
There is usually a British resource for the nuts. but they are about 3 situations as costly as the US ones. :-). Hardinge will sell metric nuts but they're also not filled atm and only the z axis nut is shown - and it is $250+ US. Cripes!
Thanks a lot once again. If I find out for specific on the 29 vs . 30 thing I'll post back here.
Greg. - Aluminum
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Categorized Machine Sales ltd advertise a metric leadscrew nut for £95 if that will be any help to you
Their web site is Categorized Machine product sales Ltd British's leading supplier of Machine Tool Extras, Components and Large Quality Hands Tools. - Titanium
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Assuming the measurements I made on mine are correct the metric anchoring screws on Adcock Shipley constructed Bridgeport are usually ACME type cut to a metric pitch on the exact same size blanks as the imperial screws.
Shortly after obtaining mine an E-Bay vendor provided a fresh longitudinal metric screw and nut products at a cost to great to miss. There was also flurry of nut products both metric and imperial around the exact same time. Screw turned out to be imperial and crazy metric. Had a higher old period sorting items out. 5 mm toss and 5 TPI are almost too close up to call. Unless you know the crafty method that can make separating almost the same metric and imperial anchoring screws easy. Ended up purchasing several pieces of nut products to obtain spares for mine and imperial set so I could buy and sell on the screw. Need to look and observe whats still in stock. I'll Evening you if there is definitely a extra metric place in the container.
Clive
PS If you decide to reduce your own consider purchasing a carbide threading place of the appropriate ACME type for the job. You understand the form will be right. Milling a machine tool feed accurate complete type ACME internal thread second hand cutter is a discomfort. Mostly because its a work most of us only do once or double so possess neither the exercise or the set-up manuals that make it quick(er). Actually require two tools because the bronze will possibly consider the edge off the initial one by the time the nut products are nearly done. Switching to a actually sharp tool for the final slice or three helps make for a nicer, easier, work. - Mark RandDiamond
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If you're heading to create new nut products, is certainly it well worth using team iron instead than bronze? Bronze is usually a piss bad selection unless there't constant lubrication. That's most likely why therefore many bridgeports have clapped out give food to anchoring screws.
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Bridgeport Leg Mill Parts in stock-Bridgeport and Servo energy feed components and program have got Bridgeport metric feed nut products for US$80 but they don't seem to mention metric lead anchoring screws.
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Clive thanks a lot. Very interesting if they are usually, in truth, ACME form. If you look up some metric nut products presently there I'd end up being curious in them. Please do Evening me if you discover something.
I have always been declining to know what the 'crafty method' is for creating the diff between metric and imperial!
dpcwright. Yes, that UK site is the location. but rather costly eh!
Re also the nut products. I did actually find them on the hardinge web site (thanks for the other link cfranks):
ShopHardinge - BP 12673
ShopHardinge - BP 126731
https://shophardinge.com/lookup.aspx?str=12060170
. and removing from the total the z-axis which is certainly like $250 US, the some other prices are usually not as well poor - in the $60 People variety.
They are usually not listed with the rest of the parts but hidden aside at the finish of their components listing under 'metric transformation sets'. But. who knows if those will fit on a UK-made leadscrew.
Tag: interesting re CI vs bronze. That might describe why I've observed so numerous CI nut products. I believed it has been cost reducing, but I suppose CI wears properly and keeps essential oil.
EDIT: Apols furthermore for the past due reply - I have been getting 'database mistakes' attempting to blog post this response. It seems it was the hyperlinks to the hardinge web site causing issues as text so I have to make 'hyperlinks' of them - Titanium
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StrayAlien
Appeared through my Bridgeport parts put and, sadly, the extra set of give food to nuts can be imperial so of no make use of to you. Sorry.
The crafty technique for creating the distinction between really identical imperial TPI and metric presentation feed anchoring screws relies on calculating the duration of thread needed for fifty percent a turn of distinction. With the coarse pitches utilized on feedscrews a basic ruler does the job just fine.
For instance 6' addresses 30 works of 5 TPI thread and (for all useful reasons) 30.5 turns of 5 mm message twine.
Going the other way 150 mm addresses 31 turns of at 5 mm frequency but only 30.5 turns of 5 TPI.
No want for micrometer accuracy. Only require to see if sized distance will go between exact same flanks or contrary flanks of the line in question. Works good on used threads too.
Someplace on my pc there should become a spreadsheet position the dimension measures for the common range of threads but darned if I can find it. Posted the results on PM a several years back (5?) but blowed if I can discover them either.
Clive - Cast Metal
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Clive, thanks a lot for looking and give thanks to for the tip. I have obtained an give of support to use an optical comparator to measure the flank angle. So, mainly because long as I have got some good thread still left at the leadscrew ends we ought to end up being able to get a defined answer. Ideally!.
Greg. - Toss Iron
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the 'huge reveal'. the champion will be:
The optical comparator was inconclusive on a worn leadscrew but a fun exercise nevertheless.
BUT. I approached Hardinge. who contacted their 'British close friends' to observe if we could obtain an solution. It had taken a few of weeks of emails. but. dignitaries, ladies and gentlemen, young man and women. It is definitely 100% ACME. Right here will be a snippet of their manufacturing specification.
Case closed.
Greg. - Gemstone
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