MadModder
Gallery, Projects and General => How do I?? => Topic started by: Darren on September 12, 2009, 10:16:16 AM
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Hi,
I'm trying to find a couple or four replacement screws for my pillar drill.
I measure them as 3.18mm / 1/8 inch at 40tpi
But what thread? I've tried downloading some charts from the downloads section but nothing seems to be there? What happened to those?
Then comes finding a supplier.....I like Precision Technology Supplies www.pts-uk.com (http://www.pts-uk.com) but can't see anything I recognise (not surprisingly for me)
Help.....are 1/8 CS screws so hard to find in the UK?
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According to this chart I think I'm looking for BSW? But not certain at all......http://mdmetric.com/tech/tict.htm
Oh give me metric any day..... :doh:
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5-40 UNC has a 1/8 inch major dia. Might be that. Not sure how to tell at that size.
http://www.gewinde-normen.de/en/unified-coarse-thread.html
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Yes I see that in my chart too, maybe they are identical.....
But this is a 60's British product, I'm guessing we didn't use American threads?
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Darren
That German site has a good few errors in it BTW. I gave up with it..
This one may help
http://www.watchman.dsl.pipex.com/thread.html
Download as an Exel and sort tpi col.
1/8 bsw is 40 tpi
Edit not 5BA? 3.2mm x 43tpi ish. sorry for mixed standards
Dave BC
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Darren,
1/8 X 40 is a standard Whitworth thread size.
I think that is the one you will require. I do have a tap and die set to make them if you get stuck.
John
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Thanks Guys....it's deff looking like 1/8 BSW.
Can't find any though..... :doh:
John, I think I might as well buy a die and make some....as daft as it sounds for what what once a common size. I think single pointing may be a challenge at these diameters and pitch?
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Yep, s-pointing would be. I once did some 3/16 BSF, 'cos 2bA had taken over as preferred thread, for a m/bike.
Took about 6 ft of steel to make 14 1" CH screws. :doh:
Never again.
About 2 wks after I did the wretched things I found a supplier of 3/16" BSF Taps/ Dies ...
You may be made of sterner stuff tho ?
Dave BC
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Sorry chaps but after you all took so much trouble to help me out I cheated... :(
I priced up a die with delivery, thought about the ongoing postage strikes currently in the UK and looked at the two screws I needed to make as I couldn't find anyone selling them......all in all it just wasn't worth the hassle, so this is what I did earlier.
The screws were for retaining a bearing cap on the belt pulley for my pillar drill. It's quite a large pulley with two roller bearings in it.
I decided to have a go at drilling two new holes and tapping for some 4mm screws I had to hand. Used the cap to locate the drill. Could have drilled the 1/8 holes but didn't just in case things went pear shaped.
(http://i401.photobucket.com/albums/pp92/thebodger/Pillar%20Drill/Rust%20removal/IMG_3433.jpg)
To my surprise the pulley is made from cast iron, lovely should tap easily then I thought to myself..... :)
And it did.....
(http://i401.photobucket.com/albums/pp92/thebodger/Pillar%20Drill/Rust%20removal/IMG_3435.jpg)
These are the screws I wanted to use. A little on the long side, quick snip and tidy up on the lathe sorted that out.
(http://i401.photobucket.com/albums/pp92/thebodger/Pillar%20Drill/Rust%20removal/IMG_3438.jpg)
And here it is all fitted together......much easier than messing about with 1/8 screws....... :)
(http://i401.photobucket.com/albums/pp92/thebodger/Pillar%20Drill/Rust%20removal/IMG_3440.jpg)
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Dont forget to stamp a little 'M' beside each screw so that whoever next takes it apart knows to use a metric screw driver. :med: