You are not logged in.

  • Register to access all forum features  

#1

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
12 October 2021 10:18 pm

Hi guys, would any of you had a pic of a 4in1 Gemmasta cabbing machine? Pre 1970. Doing a restoration of the below.1634037411_4a582aaa-3ab9-46a3-b50f-11c37792a88e.jpg
1634037411_68fe8b3c-0a47-4e54-b38a-6bb2ab109b9c.jpg

Thank you. Joe

2 users like this post: silver, aussiefarmer

#2

aussiefarmer
Member
Joined: 26 July 2015
Posts: 4,783
Member
12 October 2021 10:43 pm

1634038995_download.jpeg-25.jpg1634039012_images.jpeg-274.jpg1634039026_images.jpeg-275.jpg


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

1 user likes this post: silver

#3

aussiefarmer
Member
Joined: 26 July 2015
Posts: 4,783
Member
12 October 2021 10:44 pm

Stole them from uncle google

Their not the same as your though

Last edited by aussiefarmer (12 October 2021 10:45 pm)


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

#4

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
12 October 2021 11:32 pm

Thanks mate, yes have seen these ones they are post 1972 or so.

#5

Martyz
Member
Joined: 02 January 2019
Posts: 167
Member
13 October 2021 11:54 am

Hey Joe,
Have you tried contacting Gemcuts in Ballina. They have taken over the manufacturing of Gemmasta and might have some original photos as well as be the source of some of your new parts.

1 user likes this post: joe

#6

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
13 October 2021 08:23 pm

Thanks Marty’s, haven’t tried yet but will do as last resort.

Last edited by joe (13 October 2021 09:21 pm)

#7

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
13 October 2021 09:24 pm

The progress so far..
1634120666_af6e2160-b3d4-4c57-bc4d-e95c44532c53.jpg
1634120666_160576e8-37f6-4b65-8ab8-6adf4cfb962b.jpg

9 users like this post: Pro-oz, silver, Martyz, Solid Luck, Eldorado, grubstake, aussiefarmer, Smoky bandit, Mackka

#8

Wally69
Member
From: Sydney
Joined: 13 December 2013
Posts: 3,516
Member
13 October 2021 10:45 pm

Nice work Joe

#9

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
13 October 2021 11:38 pm

Cheers Wally, the motor is next

#10

Martyz
Member
Joined: 02 January 2019
Posts: 167
Member
14 October 2021 08:16 am

Looks great Joe. I know it’s hindsight but I carefully taped over the original Gemmasta sticker on mine because I knew I couldn’t get another one. If you’ve done all that work in the last two days then you’re quicker than me.
It’s great to see another machine even older than mine brought back to life. I hope it brings you just as much joy. thumbsup thumbsup

1 user likes this post: joe

#11

Martyz
Member
Joined: 02 January 2019
Posts: 167
Member
14 October 2021 09:17 am

Hey Joe,
I just noticed that you’re motor is going to be bolted down on four sides. If you want to change the speed of your machine by shifting the belt onto a different pulley wheel then you will have to loosen the bolts. The person who owned my machine set the motor up on a hinge so that if you are using the slicing wheel you can easily speed it up by just tilting the motor and shifting the belt. Works great.1634163394_f6fd9f9b-2e15-4999-97ac-c898a6b66e28.jpg

1 user likes this post: joe

#12

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
14 October 2021 10:01 am

Nice Marty, yes the masking tape still over the logo. Smart re: changing speed for the cutter. What speed is your motor?

#13

Martyz
Member
Joined: 02 January 2019
Posts: 167
Member
14 October 2021 04:20 pm

I don’t really know much about electric motors but here is the specification plate.
1634188776_1fc1d2f8-cac8-4b7a-b22e-9bb91c16a266.jpg

1 user likes this post: joe

#14

Mike678
Member
Joined: 21 October 2019
Posts: 889
Member
14 October 2021 05:18 pm

You should check the speed rating on your grinding wheels . Do not exceed that or they could shatter .

The speed can be calculated by knowing the size of the pulleys . If the motor pulley is 4 inch and the shaft pulley is 2 inch then that is a ratio of 2 to 1 . So it is going to now spin at 2 X 1425 = 2850 R.P.M. Just be careful about increasing the speed .

Make sure the frame is earthed , clean the paint off and make a good clean metal to metal contact . Water and electricity do not mix . Has the power point or your house got an R.C.D. fitted ?

Last edited by Mike678 (14 October 2021 05:24 pm)


MWB 1989 All ready to go ......

1 user likes this post: joe

#15

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
14 October 2021 06:16 pm

Handy tip Mike. Thanks

Motor pulley = 71mm
Shaft pulley = 53mm

71/53= 1.34 (ratio 1:1.34)

1.34x1425rpm =1909rpm at the shaft

Recommend rpm on the wheels is 1600rpm

300rpm over recommendation hmm.

#16

Martyz
Member
Joined: 02 January 2019
Posts: 167
Member
14 October 2021 08:43 pm

Thanks Mike. I had to run off and check my pulley ratios to make sure nothing was going to self destruct.
For cutting and polishing I use a 1:1 ratio, so about 1425 rpm.
For slicing I sometimes like to drop to a smaller pulley on the machine which brings it to 1:1.25 or about 1780 rpm.
Ideally I’d like to be able to drop the speed lower than 1425 rpm for polishing but I get the job done.

#17

RockRat
Member
Joined: 26 May 2018
Posts: 372
Member
14 October 2021 09:46 pm

Martyz wrote:

Thanks Mike. I had to run off and check my pulley ratios to make sure nothing was going to self destruct.
For cutting and polishing I use a 1:1 ratio, so about 1425 rpm.
For slicing I sometimes like to drop to a smaller pulley on the machine which brings it to 1:1.25 or about 1780 rpm.
Ideally I’d like to be able to drop the speed lower than 1425 rpm for polishing but I get the job done.

.................................................................................

Maybe one of these, i put one similar on my wood lathe.

https://www.jaycar.com.au/240v-10a-delu … t/p/KC5478

#18

joe
Member
Joined: 06 February 2013
Posts: 1,189
Member
14 October 2021 10:02 pm

I think the motors we have are induction.

Note: This project is designed for brush type motors and is not suitable for induction motors or shaded pole motors.

#19

Martyz
Member
Joined: 02 January 2019
Posts: 167
Member
15 October 2021 08:01 am

Thanks Rockrat. Electrics are not really my thing and it sounds like my old motor might not be the right type. If I ever have to change my motor I might look at a setup that works this way.


Top