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Thread: saddle measurements
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23rd Sep 2021, 09:39 PM #1australian metalworking hobbyist
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saddle measurements
Hi All,
I need some additional data on the Hercus saddle dovetails. It seems that there is some differences in the dovetail width on the early Hercus 9's and the rest of the hercus 9 and 260's, up to about 0.035". This makes it hard to know which version to supply for the extended cross slide and thread stop. If I make them to fit all generations, there is a lot of unwanted space between the gib and the cross slide.
I need owners of early model 9's, up to machine 8000, to take accurate measurements as per the attached pic.
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24th Sep 2021, 10:01 AM #2Mechanical Butcher
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I have Hercus 9A and 260 lathes.
My 9 inch Hercus has serial no. A1578
I measured at the front of the saddle dovetails.
The 9A is about 0.015" wider than my 260 at the saddle dovetail.
The cross slide on the 260 has also been used on the 9A. It was made as an aftermarket accessory for a Boxford lathe, and works fine on both my Hercus lathes.
Jordan
Addit: See other message below for corrections.
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24th Sep 2021, 12:22 PM #3australian metalworking hobbyist
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24th Sep 2021, 12:54 PM #4
Using 2 x 3/8 rods and a Starrett mic, I have the following results.
S/n 911: 2.548"
S/n 2100: 2.553"
S/n 12065: 2.533"
Surprised at the variation, although I did know that the after market T slotted cross slide I bought off you a few years ago would not fit on the 1943 machine, but fitted perfectly on the 1968 machine. I assumed a bit of work on the gib strip would have fixed it, but never tried. The 1943 machine now has the turret and cross slide attachments which fit perfectly. I reckon there is a slight difference in centre height off the saddle with the 1943 machine...but that might just be wear.
Hope that helps, cheers, Tony
Sent from my SM-N976B using Tapatalk
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24th Sep 2021, 03:40 PM #5australian metalworking hobbyist
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[QUOTE=Silversprings;1989610]Using 2 x 3/8 rods and a Starrett mic, I have the following results.
S/n 911: 2.548"
S/n 2100: 2.553"
S/n 12065: 2.533"
Surprised at the variation, although I did know that the after market T slotted cross slide I bought off you a few years ago would not fit on the 1943 machine, but fitted perfectly on the 1968 machine. I assumed a bit of work on the gib strip would have fixed it, but never tried. The 1943 machine now has the turret and cross slide attachments which fit perfectly. I reckon there is a slight difference in centre height off the saddle with the 1943 machine...but that might just be wear.
Hope that helps, cheers, Tony
HI Tony,
That's about what I was expecting. You are right about the gib, I supply a thinner one for the older machines, just trying to work out when they started making the thinner dovetail. At least we know, those up to 2100 had the wider one. Hopefully some of the others will confirm that.
Mal
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24th Sep 2021, 07:15 PM #6Mechanical Butcher
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I misread the rod diameter as 1/2".
These new measurements are with 3/8" drill bits.
9" - 2.542"
260 - 2.533"
Jordan
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25th Sep 2021, 02:22 PM #7Diamond Member
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I couldn't find imperial precision ground round rod, and all my 3/8 drills are way undersize, but a few end mills were pretty good:
IMG_0001.jpg IMG_0002.jpg
Appears to be 2.528":
IMG_0003.jpg
but my 9 is a bit is a bastard; bed & gear cover are serial C7967, but tailstock says 6330;
so who knows how old the carriage is
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25th Sep 2021, 04:00 PM #8australian metalworking hobbyist
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27th Sep 2021, 11:31 AM #9Golden Member
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Is my machine early enough Mal?
Done have the required dowel pins but I need to grab some drills and sure I can cut one up to get the measurements. Need to measure them myself as I’m planning on scraping the wear out at some point.
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30th Sep 2021, 02:31 PM #10australian metalworking hobbyist
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30th Sep 2021, 05:05 PM #11Golden Member
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Here’s mine Mal, not sure if I’m doing something wrong with the measurements but this is a lot more wear than I would have expected and hoped:
My pins are also a fraction under size:
2.564”
Front to back:
2.555”
2.558”
2.545”
2.564”
2.575”
That low spot seems like a bit of an outlier but I’ve measured it loads of times. Wasn’t expecting 30 thousandths of wear and that possibly puts the scraping job a bit too far out of my reach.
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30th Sep 2021, 07:31 PM #12Most Valued Member
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Have you been able to determine if the wear is uniform on both sides?
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30th Sep 2021, 10:07 PM #13Golden Member
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1st Oct 2021, 09:21 AM #14Most Valued Member
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Having never had to do this I would think if you could source a piece of suitable material at the 3/8" diameter that is as long as the cross slide, you should be able to either eyeball a gap along the dovetail, or given the amount of wear you could check it with a feeler.
You may even be able to use a straight edge if you can get it into a suitable position.
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