Allchin Gears- thinking of using pre-cut chinese

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Allchin Gears- thinking of using pre-cut chinese

This topic has 7 replies, 6 voices, and was last updated 11 November 2019 at 21:27 by Phil JOHNS.

Viewing 8 posts - 1 through 8 (of 8 total)

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11 November 2019 at 17:12 #436884
Phil JOHNS
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@philjohns74870
I am starting to build an Allchin TE 1.5 scale. I do not have the necessary gear cutters or indeed the machines to cut the gears so was looking for an alternatives before I mark out and drill the horn plates.

It would seem to me that chinese 1.5 module gears are almost the same diameter as the plans for the same number of teeth albeit a bit thicker but I could reduce their width.

What I was thinking was to buy a set or at least some of the require tooth counts and actually measure them when meshed on shafts and adjust the bearing spacing accordingly on the horn plates.

My two questions are,

Is this practical

and are there any other problems I have not foreseen with this idea such as clearance or interference with the parts?
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11 November 2019 at 17:12 #2928
Phil JOHNS
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@philjohns74870
11 November 2019 at 17:49 #436887
Bob Brown 1
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@bobbrown1
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11 November 2019 at 18:29 #436893
JasonB
Moderator
@jasonb
Bit pricey those, have a look at these, I've used them on a couple of engines.

There is not much difference between the 1.5MOD and 16DP, probably best to plot it out and see where you need to move things, PCDs are easy enough to look up or calculate. As it's a 3 shaft engine
11 November 2019 at 18:39 #436896
John Reese
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@johnreese12848
Recently I bought 3 gears to replace the missing change gears on my Nardini lathe. I searched on eBay to find the best prices. The 40 and 100 tooth gears came from Chinese vendors. The 127 tooth gear came from the Netherlands. I was amazed at how inexpensive the gears were.
11 November 2019 at 19:41 #436904
John Hinkley
Participant
@johnhinkley26699
Phil,

My go to program for gears is GearDXF, available free from here:

GearDXF download

As Jason says, there's very little difference between 1.5MOD and 16DP. I just input figures for a 40 tooth gear and the difference in diametral pitch is 0.020 inches. If you have play around with the specifications of the gears you require, it will allow you to see the differences and make your selection of suitable gears easier to visualise.

John
11 November 2019 at 20:48 #436915
Ron Laden
Participant
@ronladen17547
Phil,

I have gone with a set of Chinese gears (picture below) for my electric engine, its my own design but a lot of it is loosely based on the Minnie. Scale is 1.625 and the gears I have gone with are 1.5 MOD.

The good points with the gears are price, the set cost 1/3rd the cost of the best UK prices I could find. They are well made and machined true and mesh together nicely.

The couple of not so good points are that they are quite thick at 15mm so the 6mm and 8mm width I need does mean quite a bit of machining. Also the dark ring you see around the teeth is from the hardening process which is on all of the gears and it really is hard, HSS doesnt like it at all so it does mean insert tooling then its not so bad. I have no idea if all Chinese gears are hardened this way so it was a bit of a surprise when they arrived.

For me the main reason for going Chinese was the cost, it was way cheaper than I could find anywhere else.

Ron

Edited By Ron Laden on 11/11/2019 20:50:51
11 November 2019 at 21:27 #436917
Phil JOHNS
Participant
@philjohns74870
Thank you for the replies.

The Geardfx download didn't like my iMac so it is going on my laptop, the laptop is slow but I keep a windows machine just for this purpose.

I will give it some more thought but as cost is a factor I'm leaning towards the chinese gears.
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