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Harrison mill levelling bolts

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Trevor Haywood23/04/2018 21:50:35
5 forum posts

Hi, does anyone know what size bolts fit the threaded base lugs on the Harrison vertical milling machine

Thanks for any replies Trevor

Edited By Trevor Haywood on 23/04/2018 21:51:05

not done it yet24/04/2018 07:15:27
7517 forum posts
20 photos

Don’t know, but relatively easy to make a good guess, based on simple measurement.

Measure core size by insering a close fitting drill shank and measuring same. Check the pitch of other fixings on the mill. The base fixings are likely of a similar thread form, so consult thread tables in engineering books or websites.

Length of lugs is easy to estimate. They may, or may not,be all the same. The age of the mill might also be a clue as to whether metric or imperial thread form.

Howard Lewis28/04/2018 12:50:30
7227 forum posts
21 photos

If the threads elsewhere on the machine are Whit or BSF, the leveling screws are likely to be the same form.

Made some 3/4 BSW leveling screws for a lathe. Despite screwcutting the threads, as a roughing operation, the final finishing with a die was hard labour.

Howard

Carl Wilson 428/04/2018 18:25:42
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670 forum posts
53 photos
Hello,

I have a Harrison horizontal/vertical Mill which I've just bought and am setting about restoring. There is nothing Whitworth or BSF on it. It's all Unc and Unf. I believe the levelling bolts are Unc.

I'm afraid I can't give much more than that as I'm not in s position to access it currently.

Edited By Carl Wilson 4 on 28/04/2018 18:29:54

not done it yet28/04/2018 18:56:33
7517 forum posts
20 photos

Check a coarse threaded stud/setscrew/bolt 1/2” in diameter, if imperial. TPI will be different for whit and unc. Other diameters will be the same TPI.

Carl Wilson 428/04/2018 19:11:12
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670 forum posts
53 photos
Not wanting to be a pedant but...watch out for those thread angles. Whit is 55 degrees and Unc is 60 degrees.
Trevor Haywood29/04/2018 11:02:48
5 forum posts

Thread size is 7/8 UNC, I bought 4 x 3" set screws with lock nuts from a local fastener supplier, mill is now sitting level

Trevor

Carl Wilson 429/04/2018 11:06:02
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670 forum posts
53 photos
Nice one Trevor. You've helped me out with that answer too. Be a while before I need to worry about levelling mine though.

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