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#1

xcvator
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From: Mornington Peninsula
Joined: 12 September 2016
Posts: 1,941
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12 August 2020 10:12 pm

My nuts are coming undone ?

Just finished my bigger and upgraded slant cabber and I've found a problem that I just hadn't foreseen, the motor is an instant on and instant off, 1400 rpm. The on is ok, but the instant stop means that the discs keep spinning (momentum ) and the locating nut comes undone, short of adding a lock nut which would be a pain in the rear, or using nylock nuts does anybody have any suggestions please ?

3 users like this post: Deepseeker, mudgee hunter, Mackka

#2

Deepseeker
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Joined: 13 August 2018
Posts: 1,955
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12 August 2020 10:14 pm

Loctite maybe? If the Nutlock one won't hold them, then surely the Studlock strength would.

Last edited by Deepseeker (12 August 2020 10:15 pm)


Try hard not to offend. Try even harder not to be offended.

2 users like this post: grubstake, Nightjar

#3

xcvator
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From: Mornington Peninsula
Joined: 12 September 2016
Posts: 1,941
Member
12 August 2020 10:44 pm

Deepseeker wrote:

Loctite maybe? If the Nutlock one won't hold them, then surely the Studlock strength would.

Loctite is a not viable solution, I have to be able to do up and undo the nut every few minutes cry

#4

Pro-oz
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From: Cairns, QLD
Joined: 04 June 2014
Posts: 287
Member
12 August 2020 10:49 pm

Can you drill into the disc and plate, and fit a locating pin/dowel? That would take the sudden stop of the nut. and stop the disc trying to keep spinning.

But hard to say not knowing how it is set up.

Cheers


Minelab Explorer SE. Minelab GPZ 7000 Equinox 800

1 user likes this post: 7.62marksman

#5

deepblue
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Joined: 08 November 2013
Posts: 462
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12 August 2020 10:50 pm

You could try a very cheap fluid coupling between the motor and the disc. That may work as there are many different types available.
cheers db

#6

Pro-oz
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From: Cairns, QLD
Joined: 04 June 2014
Posts: 287
Member
12 August 2020 11:04 pm

I've been thinking about this, with the weight of the disc doesn't the motor want to run on? Why the the sudden stop?


Minelab Explorer SE. Minelab GPZ 7000 Equinox 800

#7

xcvator
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From: Mornington Peninsula
Joined: 12 September 2016
Posts: 1,941
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12 August 2020 11:28 pm

Prooz wrote:

I've been thinking about this, with the weight of the disc doesn't the motor want to run on? Why the the sudden stop?

The disc is only about 350 grams, perhaps a heavy backing plate might work

#8

RM Outback
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Joined: 10 March 2016
Posts: 7,067
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12 August 2020 11:58 pm

1400rmp is worth the price of nylock nuts, not worth trying to reinvent the wheel Keith short cuts cost sad . The pain you mention will be less painful than that of a thousand unforeseen misery moments, we never stop learning beer

Last edited by RM Outback (12 August 2020 11:58 pm)

1 user likes this post: wiley coyote

#9

wiley coyote
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Joined: 21 May 2016
Posts: 247
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13 August 2020 12:22 am

Try pulling the plug out of the power point while the motor's running, to see if this slows it down gradually, rather than the sudden stop when switched off at the machine. I'm just thinking there could be a brake type system that could be activated by the off switch. Putting a locking dowel on the disc might cause it to shatter in a sudden stop. I'd be hiding under the bench, with only my hand on the switch, the first few times I tried it. wiley. wink

1 user likes this post: pinfire opals

#10

aussiefarmer
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Joined: 26 July 2015
Posts: 4,703
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13 August 2020 08:32 am

If your constantly undoing the nuts nylock nuts will be a waste of time as they soon loose their grip, tightening the discs on the shaft is the only solution i can see , a bit of tape on the shaft tapered if possible should prevent them running on. Inmho.


Wish in one hand and poo in the other , See which one fills up first !

#11

xcvator
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From: Mornington Peninsula
Joined: 12 September 2016
Posts: 1,941
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13 August 2020 10:00 am

going to try a voltage speed controller , I might be able to slow it down gradually instead of the hard stop

1 user likes this post: silver

#12

Nightjar
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From: Home-Waikiki, Prospect-Leonora
Joined: 26 September 2013
Posts: 2,386
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13 August 2020 11:57 am

Xcvator, Have no idea, the design of your machine, however if a bolt and nut are involved, you could fit a left hand threaded bolt.
Some early model US cars used left hand wheel studs.

https://www.ebay.com.au/sch/i.html?_nkw … s4QAvD_BwE


The only place success comes before work is in the dictionary.
Happy Hunting, Nightjar.

4 users like this post: Mackka, numpty, pinfire opals, CreviceSucker

#13

xcvator
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From: Mornington Peninsula
Joined: 12 September 2016
Posts: 1,941
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13 August 2020 04:46 pm

Well after some experimenting today I have ascertained that I need more weight ( at least 1 kg) for everything to work properly. With this added weight the motor doesn't stop dead but runs on a bit so the holding nut stays done up.

Anyone know where I can get a backing plate or master lap, 8" diameter that weighs about a kilo ?

#14

silver
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Joined: 19 December 2013
Posts: 18,111
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13 August 2020 05:01 pm

Won't make your motor get hot with the instant on with the extra weight will it ? tongue


What a great day ! ,... " I'll see you in the field ".

#15

Pro-oz
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From: Cairns, QLD
Joined: 04 June 2014
Posts: 287
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13 August 2020 08:06 pm

xcvator wrote:

Well after some experimenting today I have ascertained that I need more weight ( at least 1 kg) for everything to work properly. With this added weight the motor doesn't stop dead but runs on a bit so the holding nut stays done up.

Anyone know where I can get a backing plate or master lap, 8" diameter that weighs about a kilo ?

Were you had your shaft adapter made, can he turn you one up, maybe.


Minelab Explorer SE. Minelab GPZ 7000 Equinox 800

#16

Dihusky
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From: Gold Coast, QLD
Joined: 16 June 2017
Posts: 1,519
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15 August 2020 06:53 pm

2 nuts and pinch lock them

#17

xcvator
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From: Mornington Peninsula
Joined: 12 September 2016
Posts: 1,941
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15 August 2020 07:38 pm

Thanks guys, I think the problem has been solved, motor is now slowing down a bit with the help of a voltage controller, now I'm waiting on a couple of 50mm flanges to be made thumbsup

#18

Pro-oz
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From: Cairns, QLD
Joined: 04 June 2014
Posts: 287
Member
15 August 2020 07:48 pm

One thing leads to another. Pleased your getting it sorted. thumbsup


Minelab Explorer SE. Minelab GPZ 7000 Equinox 800

#19

Gilly47
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From: Currently on Tour, QLD
Joined: 18 January 2015
Posts: 843
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15 August 2020 10:03 pm

try a scotch key
power


1 wife 1 dog and a sieve. NAPFA & QSMA member,

#20

Sandta
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From: Newcastle, NSW
Joined: 04 June 2014
Posts: 4,584
Member
15 August 2020 11:52 pm

If it is a brake motor its probably adjustable
Pulling the plug will be no different than flicking the switch
Once de-energised the brake pulls in


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