Bodger
Cast Iron
- Joined
- Sep 23, 2007
- Location
- Cavan, Ireland
VintageMachinery.org Photo Index Feed
scroll down to lat pic, a drill using half a sphere for varying speed
scroll down to lat pic, a drill using half a sphere for varying speed
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Interesting method of vaiable speed
- Thread starter Bodger
- Start date
- Replies 19
- Views 7,618
atomarc
Diamond
- Joined
- Mar 16, 2009
- Location
- Eureka, CA
That really is cool...I like it!
Stuart
Stuart
Billtodd
Titanium
- Joined
- Feb 8, 2009
I've seen friction discs before, but i think that's a first for a hemisphere
Bill
BTW This old Crofts Varispeed drive unit might be of interest
The plate reads:
-------------------------------------------------
Crofts C-JR Varispeed Control
ERECTION:- Set V-ropes on cone pulleys. Place Driven V-rope over driven pulley. Move lever towards motor and lock in position just short of full travel. Adjust C-JR unit until rope is tensioned correctly. Fit driving V-rope over motor pulley. Adjust motor on slide rails to tension rope. Check for alignment. Reset C-JR unit after 5 days to take up initial stretch of ropes
Lubrication:- Lubricate regularly. Use a good quality mineral grease. Cone face must be kept perfectly dry and free from oil or grease at all times.
Note:- Change speed only when unit is running. Operating lever must be moved over full travel at least once or twice every day when unit is running.
--------------------------------------------------
Bill
BTW This old Crofts Varispeed drive unit might be of interest
The plate reads:
-------------------------------------------------
Crofts C-JR Varispeed Control
ERECTION:- Set V-ropes on cone pulleys. Place Driven V-rope over driven pulley. Move lever towards motor and lock in position just short of full travel. Adjust C-JR unit until rope is tensioned correctly. Fit driving V-rope over motor pulley. Adjust motor on slide rails to tension rope. Check for alignment. Reset C-JR unit after 5 days to take up initial stretch of ropes
Lubrication:- Lubricate regularly. Use a good quality mineral grease. Cone face must be kept perfectly dry and free from oil or grease at all times.
Note:- Change speed only when unit is running. Operating lever must be moved over full travel at least once or twice every day when unit is running.
--------------------------------------------------
Attachments
Mel in WA
Hot Rolled
- Joined
- Aug 29, 2005
- Location
- Castle Rock, WA
I have seen a couple of the hemisphere friction drive drill presses before, and would sure like to have one to play with.
Mel
Mel
fciron
Stainless
- Joined
- Oct 14, 2009
- Location
- Louisville, KY, USA
Very cool! I saw a disk variable speed unit while looking for information on my Barnes drill press, but that hemisphere rocks. Maybe I have a project where I can make one. 
USMCPOP
Titanium
- Joined
- Jul 15, 2005
- Location
- Midlothian, Virginia
Is this what was supposed to be the last pic in the list of most recent photos?
VintageMachinery.org - Photo Index - Albany Hardware Specialty Manufacturing Co. - Variable Speed Drive
VintageMachinery.org - Photo Index - Albany Hardware Specialty Manufacturing Co. - Variable Speed Drive
DWF
Plastic
- Joined
- Jun 18, 2010
- Location
- Wisconsin, USA
Variable Drive DP
Although I have yet to restore this drill press, I expect it will perform as well as the black one that I restored and now have in service. It took a little doing to deliver all of the torque from the motor to the spindle, but after lightening the lube in the hemisphere bearing and applying belt dressing to the drive belt, I can now stall the motor under heavy load and in the highest ratio on the variable drive. I'm looking forward to putting this one into service as well, but it will most likely take another 150+ hours of hard work to restore. The Albany Hardware Specialty Mfg. Co. did a fantastic job designing and producing a very robust, functional and "user friendly" drill press. After looking for years to find a floor model, metal working drill press with sufficient capacity and, most of all, an excellent variable speed drive, I'm glad to have "stumbled" upon these AHS drill presses. Attached is DP #2 as purchased, DP #1 restored and DP #1 as purchased.
Although I have yet to restore this drill press, I expect it will perform as well as the black one that I restored and now have in service. It took a little doing to deliver all of the torque from the motor to the spindle, but after lightening the lube in the hemisphere bearing and applying belt dressing to the drive belt, I can now stall the motor under heavy load and in the highest ratio on the variable drive. I'm looking forward to putting this one into service as well, but it will most likely take another 150+ hours of hard work to restore. The Albany Hardware Specialty Mfg. Co. did a fantastic job designing and producing a very robust, functional and "user friendly" drill press. After looking for years to find a floor model, metal working drill press with sufficient capacity and, most of all, an excellent variable speed drive, I'm glad to have "stumbled" upon these AHS drill presses. Attached is DP #2 as purchased, DP #1 restored and DP #1 as purchased.
Attachments
k3vyl
Stainless
- Joined
- Feb 13, 2008
- Location
- newark DE USA
drive
That is one truly elegant VSD.
That is one truly elegant VSD.
Robert Grauman
Aluminum
- Joined
- Oct 9, 2004
- Location
- Canada
Drill Press
I can't get the link posted by Bodger to open, but I think the machine in the link posted by USMCPOP is this one: <US Patent 902635> issued to Morgan Saxton of Albany, Wisconsin, for "Gearing for Drill-Press" on October 20, 1908.
I have taken two of the patent drawings and put them side by side below.
Robert Grauman
I can't get the link posted by Bodger to open, but I think the machine in the link posted by USMCPOP is this one: <US Patent 902635> issued to Morgan Saxton of Albany, Wisconsin, for "Gearing for Drill-Press" on October 20, 1908.
I have taken two of the patent drawings and put them side by side below.
Robert Grauman
Bruce Johnson
Stainless
- Joined
- Jan 8, 2006
- Location
- Burbank, CA USA
That was a golden age of mechanical creativity. For those of you who haven't seen it, here's the thread on my Knecht Brothers drill press, another competitor in the variable speed, friction drive sensitive drill field. It's from the same time period, around 1905.
http://www.practicalmachinist.com/v...t-brothers-variable-speed-drill-press-114154/
http://www.practicalmachinist.com/v...t-brothers-variable-speed-drill-press-114154/
lazarus
Hot Rolled
- Joined
- Jan 20, 2008
- Location
- McKenney, Va
Beautiful job DWF
magneticanomaly
Titanium
- Joined
- Mar 22, 2007
- Location
- On Elk Mountain, West Virginia, USA
The correct terminology for this type is the "Camel's Ball Drill".
(well I'm 11 days late)
(well I'm 11 days late)
DWF
Plastic
- Joined
- Jun 18, 2010
- Location
- Wisconsin, USA
AHS DP in CA
While doing some research on this DP and AHS Mfg. I found out that there is an AHS DP exactly like the one pictured in this patent in CA. Here are some pictures that the owner, John Chadwick, sent to me. He told me that he's owned and used it for many years and is very attached to it. He also knows some of the history of the company, so I'm trying to work with him to put a paper together in an effort to preserve as much history as possible before it disappears.
I can't get the link posted by Bodger to open, but I think the machine in the link posted by USMCPOP is this one: <US Patent 902635> issued to Morgan Saxton of Albany, Wisconsin, for "Gearing for Drill-Press" on October 20, 1908.
I have taken two of the patent drawings and put them side by side below.
Robert Grauman
While doing some research on this DP and AHS Mfg. I found out that there is an AHS DP exactly like the one pictured in this patent in CA. Here are some pictures that the owner, John Chadwick, sent to me. He told me that he's owned and used it for many years and is very attached to it. He also knows some of the history of the company, so I'm trying to work with him to put a paper together in an effort to preserve as much history as possible before it disappears.
Attachments
aura
Plastic
- Joined
- Feb 8, 2006
- Location
- Rhode Isand
aura
Plastic
- Joined
- Feb 8, 2006
- Location
- Rhode Isand
Billtodd
Titanium
- Joined
- Feb 8, 2009
follow the Google patent link, view pdf and you will see the original, readable document.
Mel in WA
Hot Rolled
- Joined
- Aug 29, 2005
- Location
- Castle Rock, WA
The 2 drive wheels have leather faces and the contact pressure is adjustable. Similar to other friction drives.
How did you determine that the friction material on the drive and driven wheels is leather? The material on both of my machines is an unknown composite that appears to have been formed around a center hub and is contained on both sides by shoulders/collars. The cross section is "T" shaped. Fortunately, all of the friction surfaces are in great shape and I haven't had to do any repair work on them. I think it would be a big undertaking to replace the friction material due to its design. - As for slippage, no, they don't slip any more than a "V" belt application. I've been able to stall the 1 hp electric motors on both machines when the flat belt that drives the cross shaft is correctly adjusted. Flat belt tension is important to getting full power to the spindle. Belt dressing comes in handy when the belt stretches or wears and can be used to put off shortening the belt, at least for a while. The machine I sold has adjustable feet that facilitates belt tension adjustment. It appears to be an original feature from the factory, but I could be wrong. The machine I still have did not come with this feature. I hope this helps. Feel free to contact me with any other questions or comments.
Hi Mel in WA, After reviewing my response to your question about the leather contact surfaces on the 2 drive wheels, I realized that my first line sounds a bit rude, which it's certainly not intended to be. I could have phrased it better. With that being cleared up, I hope, I'm curious about the reference to leather on the drive and driven wheels. It's possible that the wheels have been 'repaired' at some point, and leather may have been used. It would be a logical choice of material. I only wanted to point out that the OEM friction material appears to be a composite and is more complicated than a strip of material on the circumference of the wheels. I would really like to know exactly what it is myself but have been unable to find out. I hope this helps clear the air.
