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Thread: Metric threading on Hercus 9A
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3rd Jun 2022, 09:14 PM #1Intermediate Member
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Metric threading on Hercus 9A
Hello all,
I did do a search for this but must admit it was a male look so please forgive me if it didn't jump into my hand.
I have need to do some metric threading on the Hercus 9A (with QC gearbox) and need some help with the gear changes and QC settings, etc.
The lathe has all the standard setup for imperial turning and threading as standard and I have (what I believe to be) a full set of metric change gears.
The gears I have are
50, 55, 65, 70, 75, 85, 90, 95
What I would like to ask is how do I use this gear set
1. In normal operation and
2. In cutting metric threads
Any advice or assistance would be greatly appreciated.
Thank you
Cheers,
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3rd Jun 2022, 09:39 PM #2Golden Member
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I am not sure if your lathe has it, but inside the cover of the change gears I have seen a chart that describes this.
It may look like this https://australianmetalworkinghobbyi...=496&limit=100
Steve
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3rd Jun 2022, 10:49 PM #3Intermediate Member
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Thank you Steve that is really UI (Useful Information) but I am sorry I do not know how to interpret what you have provided.
The gears related to in the link do not correlate with the ones I have, and I am sorry I do not have the capacity to do the math to equate which is equal to which, but I understand what you are offering.
Can you please provide more information.
Cheers,
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3rd Jun 2022, 11:09 PM #4Member
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Ross, it might be easier to tell us what threads you are trying to cut and we can tell you what gears to use.
Also what is the length of the thread you are going to make ?
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4th Jun 2022, 09:22 AM #5Golden Member
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I am sure someone more experienced will chime in. It is my understanding that you would need a set of 60 and 63 gear or 127 and 100 gears. That is assuming you have an imperial lead screw. A photo of the placards on the lathe will assist others to confirm what you have and what you need to achieve what you want.
Steve
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4th Jun 2022, 10:33 AM #6Most Valued Member
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4th Jun 2022, 12:11 PM #7Intermediate Member
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Thank you Jack exactly what I could not find in my search.
So it seems from that my change gears are not for metric cutting.
Which raises the question what are these ratios used for?
@Somedayplumbing the part requires ~10mm at each end of a 70mm rod to have 12x1.5 and 13x1
@Steve the placard is the standard imperial one as shown in Jack's photo in the link
Cheers,
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4th Jun 2022, 04:19 PM #8Intermediate Member
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Further to this, and I suppose to a certain extent thinking out loud, the conversion to metric using the 127 and 100 tooth gears gives a ratio of 1.27.
If I use the 95 and 75 (which I do have) will yield a ratio of 1.2666 which, if I'm doing my maths correctly, gives an acceptable error of just 0.033%
Can somebody please tell me whether this is correct or if I am barking up the wrong tree?
Thank you
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4th Jun 2022, 05:34 PM #9Most Valued Member
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4th Jun 2022, 09:18 PM #10Intermediate Member
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Hahaha thank you SurfinNev that is where I am getting most of my math from. That site gave me all the information in my previous post, I simply did some extra calculations based on what was there. If you look, I have plagiarised some of his calculations.
I do appreciate the link and if anyone else finds it useful I hope they give you credit too.
Cheers,
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3rd Jul 2022, 03:23 PM #11Intermediate Member
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Apologise for the delayed response, have been tinkering and trying to sort this out.
As it turns out these are not change gears but gearbox gears for the tumbler gearbox on my 9A.
As a reminder the gears I have are 50, 55, 65, 70, 75, 85, 90, 95 and they are a lot thinner and different pitch to the change gears.
If I swap these into the gearbox does that make it a metric gearbox or something else?
If they do as I want need do I need to change anything else? Charts, thread chaser, etc. I assume.
If not above what are they for?
Or am I completely barking up the wrong tree?
If this does not get any replies I will post a new topic.
Thanks all.
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3rd Jul 2022, 05:19 PM #12Most Valued Member
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Throw us a bone here Ross and post a pic of your gears.
Chris
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3rd Jul 2022, 11:39 PM #13Senior Member
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Hi Ross
I can tell you now that those gears are not for the gearbox as they definitely will not fit in there and will definitely not turn it into a metric gearbox, the metric gearbox is a completely different set-up to the imperial and they used the 3 mm pitch lead screw so it seems as though the gears you have would be for something else completely, best bet is to buy the right set of change gears or see if someone can lend you a set.
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7th Jul 2022, 11:29 AM #14Intermediate Member
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7th Jul 2022, 09:47 PM #15Intermediate Member
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Have a picture and each gear is 7/32" wide. Sorry do not have the pitch but number of teeth are as previous.
gears.jpg
Thank you for any assistance with this.
Cheers,
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