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Allchin help

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Dougie Swan02/07/2021 15:33:27
214 forum posts
53 photos

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

br02/07/2021 17:32:08
824 forum posts
7 photos

Not done Allchin but Minnie.so may be similar so will try to help.

Can you post a picture of casting please on here or in album - both sides ?

bill

Clive Brown 102/07/2021 17:33:59
743 forum posts
37 photos

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

Dougie Swan02/07/2021 17:55:08
214 forum posts
53 photos

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

Dougie Swan02/07/2021 17:55:09
214 forum posts
53 photos

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

br02/07/2021 18:28:46
824 forum posts
7 photos

Allchin winding drum casting is machined to a finished size of 4.25 inch o/d and a finished width of 1 and 1/32 inch.

This is from Reeves drawing they sent me when I was making my 3/4 inch scale allchin.

I suspect the rachet is michined from bar and attached to it, as Minnie is. and as on my 3/4 model, but stand to be corrected

bill

JasonB02/07/2021 19:23:38
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Moderator
21965 forum posts
2531 photos
1 articles

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

Dougie Swan03/07/2021 10:53:13
214 forum posts
53 photos

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

Dougie Swan03/07/2021 13:19:20
214 forum posts
53 photos

Thanks Jason

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

Dougie

Clive Brown 103/07/2021 13:23:07
743 forum posts
37 photos

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.

JasonB03/07/2021 16:07:35
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Moderator
21965 forum posts
2531 photos
1 articles

I would say it is the "left hand driving boss" and you will have to mill the dogs into the outer edge.

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