3/16” BSF mill gib screws

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3/16” BSF mill gib screws

This topic has 12 replies, 8 voices, and was last updated 22 February 2025 at 22:17 by Michael Gilligan.

Viewing 13 posts - 1 through 13 (of 13 total)

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22 February 2025 at 17:20 #784969
Graham Horne 2
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@grahamhorne2
I am doing up a Centec 2B mill. The knee to column gibs screws and the cross slide gib screws are all longish 3/16” BSF grub screws and I need about 16 of them. I can’t find 3/16” BSF grub screws of the length I need or longer. Either someone may know where I might find these or advice on any issues with with thread chasing with a 3/16” UNF tap and converting to UNF. The difference is the thread angle and shape. Any ideas?
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22 February 2025 at 17:36 #784971
Clive Brown 1
Participant
@clivebrown1
Are you sure they’re not 2BA?
22 February 2025 at 17:38 #784973
Tony Pratt 1
Participant
@tonypratt1
I presume you mean convert to 10-32 UNF as 3/16 BSF is 32 tpi? Off the top of my head your idea should work for this application.

Tony
22 February 2025 at 17:39 #784975
Michael Gilligan
Participant
@michaelgilligan61133
Any use ?

https://arunfasteners.co.uk/product/bsf-socket-set-grub-screws/

MichaelG.

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Note: PCP = Plain Cup Point
22 February 2025 at 17:47 #784978
Nicholas Farr
Participant
@nicholasfarr14254
Hi, some 7/8″ long at arunfasteners

Regards Nick.

MichaelG beat me to the same place.
22 February 2025 at 18:53 #784983
Graham Horne 2
Participant
@grahamhorne2
On 22 February 2025 at 17:36 Clive Brown 1 Said:

Are you sure they’re not 2BA?

I don’t really know what 2BA means but research says it’s metric but this mill is 70 years old so I think they are imperial.
22 February 2025 at 19:05 #784993
Graham Horne 2
Participant
@grahamhorne2
Thanks Nicholas and Michael but 7/8” is too short. I need more like 1 1/4” long.
22 February 2025 at 19:26 #785002
bernard towers
Participant
@bernardtowers37738
If your not familiar with what BA is I suggest you download a Chart which will be very informative
22 February 2025 at 19:28 #785005
DC31k
Participant
@dc31k
Buy any 3/16″ BSF fastener with an appropriate length of thread on it, cut off its head with a hacksaw and use the same hacksaw to make a slotted grub screw.

Go direct to this eBay seller’s website or pick up the phone and explain your requirements, and they will assist:

https://www.ebay.co.uk/itm/334554385309

I cite this listing as it notes 3/16 BSF x 1 3/4″ long fully threaded.

—

Edit: turns out the post saying BA was correct all along:

https://www.ba-bolts.co.uk/bsfallen.html
22 February 2025 at 19:31 #785008
Michael Gilligan
Participant
@michaelgilligan61133
On 22 February 2025 at 19:05 Graham Horne 2 Said:

Thanks Nicholas and Michael but 7/8” is too short. I need more like 1 1/4” long.

I don’t disbelieve you, but I am struggling to understand why they would build it like that.

Could you please post some pictures, showing each end of an original screw ?

Thanks

MichaelG.
22 February 2025 at 19:38 #785013
Roderick Jenkins
Participant
@roderickjenkins93242
Graham,

BA stands for British Association. Although derived from a metric thread system BA threads were/are a thread standard used in British industry for threads smaller than 1/4″. Myford lathes were contemporary with Centec mills and Myford used 2BA screws and BSF on their machines. Worth double checking I suggest.

HTH,

Rod
22 February 2025 at 20:49 #785020
Graham Horne 2
Participant
@grahamhorne2
On 22 February 2025 at 19:38 Roderick Jenkins Said:

Graham,

BA stands for British Association. Although derived from a metric thread system BA threads were/are a thread standard used in British industry for threads smaller than 1/4″. Myford lathes were contemporary with Centec mills and Myford used 2BA screws and BSF on their machines. Worth double checking I suggest.

HTH,

Rod

Thanks for that explanation. I had never heard of BA threads. I’m a metric guy I am afraid and the old thread types I’m learning.
22 February 2025 at 22:17 #785029
Michael Gilligan
Participant
@michaelgilligan61133
I can hardly believe that I found this on one quick search:

http://www.small-lathes.co.uk/Files/1.663784Centec_2x_Setup_Guide.pdf

… The pictures are unfortunately rather ‘jaggy’ but; might one assume that the grub-screws in question are item 92 [quantity unspecified] ?

MichaelG.

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