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11th December 2013, 06:42 PM #1Philomath in training
- Join Date
- Oct 2011
- Location
- Adelaide
- Age
- 59
- Posts
- 3,148
Variable speed drill press - Old style
Was wandering through a well known Adelaide landmark this morning and spotted this drill press
IMG_0072 (Medium).jpg IMG_0071 (Medium).jpg
At first I thought that the crank at the top was for feed but then I realised that it was for variable speed. A rubber tyre runs on the disc and depending on the position delivers from close to zero rpm up to around twice the motor rpm in both forward and reverse. I think the base had Macson cast into it but I'm not sure. An OH&S nightmare these days but none of this fancy VFD crap. The washing machine motor looks like a later addition so I wonder if it was even line shaft driven at one stage (brackets on the side for a back gear?).
I may be going back there soon on a mission for Ewan, so sing out if anyone wants more details.
Michael
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11th December 2013, 07:53 PM #2
Somewhere in amongst my boxes of bits i have a similar drive unit that was taken from an edge bander. It was used to control the speed of the conveyor. from memory the best it could do was 1:1, right down to super slow speeds.
Ew1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.
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11th December 2013, 07:56 PM #3
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11th December 2013, 08:15 PM #4Mechanical Butcher
- Join Date
- Oct 2004
- Location
- Southern Highlands NSW
- Posts
- 911
Some Vintage motor vehicles used this system, and yes it could also provide reverse.
It's frightfully inefficient, but a cheap and easy way to get continuously variable transmission.
A friend had a Ner-a-car motorcyle with this method, so I was able to check it out closely.
Jordan
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11th December 2013, 09:27 PM #5SENIOR MEMBER
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- Sep 2011
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- Ballarat
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- 65
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- 2,656
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11th December 2013, 10:25 PM #6Distracted Member
- Join Date
- May 2010
- Location
- Lower Lakes SA
- Age
- 59
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- 2,556
I've seen pictures of two similar drives on old drills, one was conical and one was spherical. I think the latter was Canadian but don't quote me. Pretty cool I thought. One of the US forums it was, either HSM or PM Antiques.
Phil is your mower a Cox?
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12th December 2013, 06:09 AM #7SENIOR MEMBER
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- Sep 2011
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- Ballarat
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- 65
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- 2,656
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13th November 2014, 06:12 PM #8
The bit missing off the side of the pulley is the belt changer, It should have two flat belt pulleys (an idler and a drive).
I just posted a very similar one
https://www.woodworkforums.com/showth...41#post1821341…..Live a Quiet Life & Work with your Hands
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14th November 2014, 01:09 AM #9Senior Member
- Join Date
- Oct 2008
- Location
- Cairns, Q
- Posts
- 351
Here's a photo of the transmission on a GWK cycle car. These were made from pre WW1 until the early twenties. The wheel at the top of the photo is the engine flywheel. The friction wheel is surfaced with "compressed paper" and the friction surface was replaced every 5000 miles as part of normal maintenance, not a major job according to contemporary reports. The transmission was said to be fairly trouble free if driven sensibly. You can see the shifting fork for the friction wheel in the left side of the friction wheel in the photo. The transmission is in neutral in the photo. Shifting the disc to the left of centre gave reverse, and to the right gave the forward speeds.
Photo was taken by Asquith who for a while contributed many interesting old machinery threads to the PM forum.
Frank
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14th November 2014, 08:52 AM #10
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14th November 2014, 09:28 AM #11
BSR record players has a wheel and disk transmission
There was a rubber disk wheel on the fixed speed motor, that ran on the underside of the platter.
Lenco turntables where similar...but the disk was an intermediate idler between a cone on the motor and the underside of the platter.
The lenco units would vary from 16rpm to 78 rpm continuous.....very much favoured by dance studios in the day.
As far as the rider mowers.....cox and greenfield mowers may have cones.....but the drive system provides no speed variation, except for slipage of the cone clutch.
These various friction clutch systems where pretty common on all sorts of equipment large and small in the time before DC motors, solid state electronics and cheap hydraulics.
There was still a lot of it beeeing sold as late as the 70's.
cheersAny thing with sharp teeth eats meat.
Most powertools have sharp teeth.
People are made of meat.
Abrasives can be just as dangerous as a blade.....and 10 times more painfull.
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14th November 2014, 06:50 PM #12
We managed for the first couple of years considering the large amount of mowing we need to do, with a Rover Ranger with that style gearing. You could adjust the ratios around to suit. I had reverse pretty slow so when I hit a difficult bit I could do it in reverse and it would go real slow. I fitted a simple blade to the front and used it to level our rainwater tanks site. This wore the driven wheel surface very thin. Still worked for a while until I retired it. The parts were available for replacement but it just did not compare to the more modern version we had acquired.
Dean