Allchin help

This topic has 11 replies, 4 voices, and was last updated 3 July 2021 at 16:07 by JasonB.

Viewing 12 posts - 1 through 12 (of 12 total)

Author

Posts
2 July 2021 at 15:33 #552281
Dougie Swan
Participant
@dougieswan43463
Hi if there are any allchin builders out there can I ask a question about the lh driving boss

Did the casting you had have the ratchet stops for the winding gear cast in or do I have to cut them myself

Neither the drawings nor the book makes it clear but some of the pictures liik different to what I have

Thanks

Dougie
Advert

2 July 2021 at 15:33 #33859
Dougie Swan
Participant
@dougieswan43463
2 July 2021 at 17:32 #552290
Former Member
Participant
@formermember12892
[This posting has been removed]
2 July 2021 at 17:33 #552291
Clive Brown 1
Participant
@clivebrown1
Hi Dougie, long time since I built my Allchin, but I'm fairly sure that the Reeves' casting had the basic shapes cast in.

No doubt some fettling with a file was needed, and probably the outside diameter was turned.

HTHs
2 July 2021 at 17:55 #552292
Dougie Swan
Participant
@dougieswan43463
Thanks for the replies

I bought a lot of old second hand iron castings that are good quality

I will post some pics tomorrow of what I think are the r and l hahd bevel gear centres

Do I still need to add pics to my album before they appear here or has it got easier?

Dougie
2 July 2021 at 17:55 #552293
Dougie Swan
Participant
@dougieswan43463
Thanks for the replies

I bought a lot of old second hand iron castings that are good quality

I will post some pics tomorrow of what I think are the r and l hahd bevel gear centres

Do I still need to add pics to my album before they appear here or has it got easier?

Dougie
2 July 2021 at 18:28 #552297
Former Member
Participant
@formermember12892
[This posting has been removed]
2 July 2021 at 19:23 #552304
JasonB
Moderator
@jasonb
The book would seem to suggest that the 8 dogs are cast in as he says the casting can't be held in a 3 jaw due to them and later says they can be cleaned up with files.

Though with various sources of castings there may be differences in patterns and it would not be hard to machine the dogs on a rotary table if not cast.

EDIT this casting on station Road has them cast in.

Edited By JasonB on 02/07/2021 19:25:00
3 July 2021 at 10:53 #552376
Dougie Swan
Participant
@dougieswan43463
Hi

These first two pics are what I thi k is the casti g for the lh drive centre without dogs cast in, it has a plain back, not like the one shown in the book and has a diameter of 3 5/16,the third pic is what I think is the right one

Any info would be appreciated

Dougie

Edited By JasonB on 03/07/2021 12:16:16
3 July 2021 at 13:19 #552417
Dougie Swan
Participant
@dougieswan43463
Thanks Jason

I was starting to loose the will to live trying to get that pic in the right thread

Dougie
3 July 2021 at 13:23 #552421
Clive Brown 1
Participant
@clivebrown1
Hi Dougie, that could be a drive centre casting without the dogs, but it's not as Reeves used to supply, and AFAIK,they were the only mainstream suppliers of 1.5" Allchin castings. Maybe a smaller supplier though.

When the Allchin design was published, milling machines were very rare in ME workshops, and rotary tables even rarer so the trade would supply the more detailed casting.
3 July 2021 at 16:07 #552439
JasonB
Moderator
@jasonb
I would say it is the "left hand driving boss" and you will have to mill the dogs into the outer edge.
Author

Posts