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8th May 2021, 04:04 AM #1Member
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- May 2021
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Back gears, a little guidance please.
Hello everyone. Well i'm new to all this and i heard/saw a video or two that said there was some back gears that let me run the lathe really slow if needed, for example when i'm doing some thread cutting with a tap ?
any ways i have a hercus or similair lathe model C i think.
Here's a picture or four.
183137958_490970938916827_1300700340532443261_n.jpg182187296_2570648806570839_1145661024345405813_n.jpg182489238_1947325765405524_3950647937140537045_n.jpg182956545_550060879310973_1668729794378849342_n.jpg
Any chance of a video or some pictures on how i would use the back gears ?
thank you
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8th May 2021, 07:40 AM #2Senior Member
- Join Date
- Dec 2014
- Location
- Tasmania
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- 102
Hi @mathuisella
Unfortunately to me it looks like your lathe has been modified and the back gears are gone. As evidenced by the whole pulley arrangement.
Typically you throw a little lever on the left of the headstock and engage a locking pin on the bull gear and yes it does gear the lathe right down.
Cheers,
ratters
Sent from my SM-G986B using Tapatalk
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8th May 2021, 07:49 AM #3Senior Member
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- Dec 2014
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- Tasmania
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- 102
On closer inspection in your second photo the bolt that goes through the square tube is where your back gear lever used to be.
If you are keen to have it you can get all the parts you need to return your machine to a more original state from Australian metalworking hobbyist website.
Cheers,
ratters
Sent from my SM-G986B using Tapatalk
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8th May 2021, 07:17 PM #4
Hi Mathuisella,
I personally would just make a lathe handle for threading use, its much more controllable as well !
21022015-01.JPG 21022015-00.JPG
This is a couple of pictures of mine. It is made from an old washing machine plastic pulley mounted on a hollow shaft that passes into the lathe spindle bore and has an expanding taper at the chuck end. The handle is tightened by the nut on the outside of the wheel.
For some reason I've not been able to find the pictures of the expanding taper end. But the tapered cone is basically a nut that is pulled into a split taper inside the spindle bore, causing it to open and grip the wall forcing the handle to turn the spindle.
To release it just loosen the nut and if needed a little tap on the end of the nut. I also put a ring on the mandrel so that I didn't push the handle too far in and cause the hand wheel to catch the gear case cover.
HTH.Best Regards:
Baron J.
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9th May 2021, 10:21 PM #5Member
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- May 2021
- Location
- australia
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- 50
Thank you
I figured out with the belt system that if i put it on it's slowest of it's 16 settings, it is slow enough to thread with a tap on the tail stock.
There's 8 settings with the belts and then a hi and low setting for the motor speed.
So not bad at all
I have another question, but it's more for a new thread
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10th May 2021, 05:59 PM #6
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13th May 2021, 01:21 PM #7Golden Member
- Join Date
- Jun 2007
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- Vic
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Hi Mathuisella,
This looks like yours if you are in Vic?
https://www.ebay.com.au/itm/13375815...cAAOSw0clgm3w0
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13th May 2021, 08:59 PM #8Member: Blue and white apron brigade
- Join Date
- Feb 2006
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- Perth
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- 7,183
That one is a flat belt Hercus.
As BaronJ says tapping under power is not easy.
The only power I use when tapping is "reverse" to speed up tap removal.
Before doing that I make sure the tap/work are free to turn.
I've heard of people loosening their lathe belts so they slip if the tap jams but that's not something I'm prepared to consider.
A Crank handle on the tail stock seems to be a good option.
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14th May 2021, 01:55 PM #9australian metalworking hobbyist
- Join Date
- Jan 2009
- Location
- Holbrook, NSW
- Age
- 73
- Posts
- 490
south bend
With regard to Mathuisella machine, I'd say it's a South Bend 9C, because it only has 2 front oilers and none on top. Plus it has the holes just behind them, which i"m pretty sure other machines don't have.
Mal
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