Motor Gland

[Dave SpringateParticipant @davespringate]

Hi, I'm trying to locate a Gland that fits this hole and thread, rather than just jam a plastic one in there. Anyone got any idea's as to if they are available from anywhere? I'm having no luck locating one at all.

[Dave SpringateParticipant @davespringate]

[John HaineParticipant @johnhaine32865]

Standard item from good electrical supplier that sells to the trade.

[Paul KempParticipant @paulkemp46892]

Dave,

Visit your local City Elctrical Factors they will likely have something in either plastic, brass or steel. However some old motors I have had some very odd threads which don't match modern standards. The one on my mill dating back to around 1960 I had to tap out to (from memory) 22mm in order to get a gland that would accept screened cable.

Paul.

[Simon Williams 3Participant @simonwilliams3]

Erm…

Not necessarily.

Depends on whether it's an imperial (e.g. 3/4 inch x 16 TPI) thread, a metric thread (e.g.M20 x 1.5 pitch) or a Pg thread which goes by the nominal bore size of the conduit.

If you can measure I.d and pitch of the thread in the hole we'd be in with a chance. The other clue is what make and nationality is the motor, and how old?

HTH Simon

[Former MemberParticipant @formermember19781]

[This posting has been removed]

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, any electrical factor should have them. Have you looked in B&Q **LINK** or Screwfix **LINK**

Regards Nick.

[Dave SpringateParticipant @davespringate]

Hi, it's not M20 that's for sure, I've tried it. Its an old Crompton Parkinson motor of unknown age. I suspect its imperial and everything I've looked up is metric. Can't seem to find a stockist of imperial fittings. I know its not really important but would have liked to get the proper fitting gland if at all possible.

[Alistair Robertson 1Participant @alistairrobertson1]

Motor threads are "usually" 3/4" Condiut. 750" o.d. x 16 threads per inch, These are NOT BSP.

Condiut is designated by the Outside Diameter.

BSP threads are designated by the nominal bore of the pipe.

Regards,

Alistair.

[Frances IoMParticipant @francesiom58905]

3/4″ by 16tpi = 3/4 UNF – dies readily available for this – even if motor is probably Whitworth thread a brass fitting should fit

[Dave SpringateParticipant @davespringate]

Posted by Alistair Robertson 1 on 07/04/2019 15:19:24:

Motor threads are "usually" 3/4" Condiut. 750" o.d. x 16 threads per inch, These are NOT BSP.

Condiut is designated by the Outside Diameter.

BSP threads are designated by the nominal bore of the pipe.

Regards,

Alistair.

Thanks Alistair

[Phil WhitleyParticipant @philwhitley94135]

looks like 3/4 conduit, which means, no you wont get one anywhere unles you can find an old sparks like me who has some in a tin under the bench! If you have any long established electrical engineers near you, try them!

[BountyboyParticipant @bountyboy]

Hello Dave Springate,

I’ve read your posting with interest as I believe I have the same issue as you in trying to identify an old gland thread size/type on a vintage electric motor.

Did you manage to identify the thread type?

Hope you read this,

Paul

[noel shelleyParticipant @noelshelley55608]

Alistair beat me to it ! It's old british conduit ! and as has been your best bet is someone with a tin of odd ones on the bench. You might be able to tap out to 20mm and use metric. for the tap try tracy tools, always very helpful. Noel.

[EmgeeParticipant @emgee]

3/4"x16 TPI (55 deg)male to 20×1.5mm (60deg)Female metal adapters are available if you don't mind a slightly extended socket on the motor.
Making a gland body from brass is not a difficult task if you are proficient on a lathe.

Emgee

[Ed DuffnerParticipant @edduffner79357]

Looking closely at the lower photo, the thread appears to be Ø16mm. A vernier or digital caliper could confirm this allowing for the thread size minus the thread depths and as Simon suggested, measuring the thread with a thread gauge would help.

There are plenty of cable glands on the RS Components web site of 16mm …and other sizes of course.

Alternatively it might be worth making enquiries with brook-crompton-parkinson-motors.

Regards,
Ed.

[Brian MorehenParticipant @brianmorehen85290]

At a guess 3/4 Conduit now Metric which will not match , If a American Motor no match . Continental ,I have found no match,

Good Luck Bee.m

[BountyboyParticipant @bountyboy]

Hello,

I've managed to identify the gland thread size on my Kennedy Hexacut, Hoover motor, it's 3/4" conduit. I believe this thread is unique to the electrical trade and not a BSP or NPT thread.

I obtained a 3/4" male to 20mm female adaptor and used a 20mm gland I had in stock to get the saw running. I would in the future like to make a gland to fit 3/4" conduit thread but until then this setup will suffice.

[BountyboyParticipant @bountyboy]

Thanks to everyone for your help and suggestions, cheers!

[EmgeeParticipant @emgee]

Hope you shortened the male thread by a good bit or will be very close to terminals.

Emgee

[john fletcher 1Participant @johnfletcher1]

Bountyboy, I've an illustrated booklet relating to your MARK l l KENNEDY portable power hack-saw, and new, they were £28-0-0 carriage paid. The NON powered units were £14-0-0, again carriage paid, no doubt by British Railways with a three wheel Scammel lorry. and trailer. Does any one know what the price is of a second hand one today, I haven't seen one advertised for a long time. John

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