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Source of 2mm Pitch Large Diameter Leadscrews

Where can i find 2mm pitch leadscrews with a diameter over 12mm

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Michael Gilligan23/05/2014 10:56:21
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23121 forum posts
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Tim,

I think it would be an excellent idea for you to adopt the DIY approach ... Then, when you've sorted out how best to do it, please write it up for MEW for the rest of us.

2mm pitch sounds good for many applications, up to quite large diameters, and I think milling with a trapezoidal-form end-mill might be the way to go ... does such a cutter exist?

MichaelG.

TimS23/05/2014 14:03:14
20 forum posts

Hi Les, the problem with a straight leadscrew swap would be the length problem; i need screws quite a bit longer than i think even an X3 would allow

studding was looking promising for a while but getting it in left and right hand was another set of fun and games

as for DRO's i had considered them instead of different pitch screws but as i needed longer screws i thought i would swap to make my maths simpler and maybe fit DRO's later i do worry about rotary encoders only showing screw rotation and not actual distance travelled... but it would seem that i am a worrier

TimS23/05/2014 14:05:46
20 forum posts

Hi Martin thanks for the extra info... i may well opt for them if i cant buy them by the meter... and a link below has helped with that

TimS23/05/2014 14:12:38
20 forum posts

Hi Ian, thanks for the info on DRO's; i need new longer screws regardless of pitch and i would like them to be as accurate as possible; i think 2mm screws are a compramise that will allow good fine control as well as not making distance moves too painful;

as for screw accuracy most places seem to quote better than 0.1mm per 300mm; i dont know if thats good or bad but it seems fairly standard regardless of the pitch; i know a DRO will be better than this but i think i might opt for CNC first

TimS23/05/2014 14:24:33
20 forum posts

Hello again Niko; your final link seems to have answered the original question; they do left and right in the sizes i need, sell nuts too and the prices are blummin great

i hope to place an order fairly soon (well as soon as i have considered any other project that could ever need a leadscrew )

TimS23/05/2014 14:39:23
20 forum posts

Hi MichaelG; the only way i could make the screws would be on the lathe; I've not done much thread cutting so it would be fun to say the least; that and the fact my metric lathe (WM180) wouldnt cut a thread long enough in one go... i was trying to work out if you could cut half the length before moving the rod to cut the other half... the only way i could come up with was to fit a nut in the tool post and unscrew the already cut part to allow machining of the rest... how accurate that would be is up for debate... i could do it on one of my imperial lathes but in all honesty i dont trust them for accuracy (a 19x18 and an ML7)

the most amusing part for me (regarding articles) is that the mill overhaul is to get me to a stage where i can work on a project which i am writing an article about... i may even get an article out of part of the mill modifications that i have never seen done before... so it may be a case of watch this space

Michael Gilligan23/05/2014 15:22:54
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23121 forum posts
1360 photos

One thought, Tim ...

As you have already found; High Precision 2mm Leadscrew is readily available [and reasonably priced] in the smaller diameters. Why not use a length of this, bushed accordingly, as a temporary replacement for the Myford Leadscrew ... You could probably modify one of the MarchantDice Nuts to be clamped by the Myford half-nuts.

MichaelG.

TimS23/05/2014 15:35:18
20 forum posts

its a good thought michael; i was going to convert it to metric but i have never really got on with it, the replacement motor is under powered and has no reverse, i dont trust it to turn parallel and fixing all that plus a leadscrew upgrade would add another project to do before i get to the one i want... 3 steps from what i want to do is just too many

on top of that i can get the screws i need for the same price as the blank materials and the new leadscrew

at least with the mill i am sorting it and it will be a permanent upgrade that i can use for all sorts, i am likely to sell the ML7 when i get half a chance; its 1940's from what i can remember and i think is all original... it needs a loving home and i'm a metric guy

Tim

TimS28/05/2014 14:30:08
20 forum posts

I thought i should post about the results of this thread as it helped me a lot i bought 2 lengths of each right and left hand 16x2mm from

http://www.metallbau-pietrzak.de/shop/index.php

i ordered them on a Sunday (a bank holiday Sunday) and they arrived nice and promptly on the Wednesday in fantastic condition; strapped to a sizeable piece of wood; wrapped in bubble wrap and in a custom box... it would have been fairly hard to damage them with this level of packing protection

price wise they were under £20 a meter which seems to be very reasonable to me

the screws also seem to be excellent, they are very smooth to the touch and look much better made than originals in my warco mill and even on my warco lathe

i didn't buy any nuts to fit them so i cannot comment on their quality (i plan to machine a section of each screw to make a tap; if that doesn't work i'll no doubt be on here asking for another option )

the only slight downside is the website is all in German; i used goggle translate on both the site and the emails i received with no problems; there are some graphics based buttons which didn't get translated but they had arrows so weren't too difficult to decipher

as you can probably tell i am rather pleased with the outcome and wanted to thank all of the contributors in this thread for making such a difference in my being able to locate exactly what i wanted

TimS

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