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Thread: Mill Power Feed Clutch
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31st May 2013, 12:34 PM #1
Mill Power Feed Clutch
I am now starting to look at designing my mill power feed from the bits discussed in a thread earlier in the year. I wish to incorporate a clutch for safety reasons and would like to know what materials would be best for the clutch surfaces?
I have just seen a YouTube video showing a unit without a clutch but where the engagement of the dog was acheived by having the entire unit sliding on shafts. Simple and easy. I am thinking of incorporating the clutch into the drive dog.
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1st June 2013, 12:35 AM #2
Hi Dean,
When you say clutch do you mean for safety, or one that can be engaged/disengaged. The safety clutch on Mlls feed would be pretty easy to reproduce, i'll post some pics if thats what your looking for.
Cheers,
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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1st June 2013, 02:39 AM #3
Sorry about that. Yes I mean a safety clutch. The engage/disengage will be acheived by making a driver dog to engage with the one that was on the shaft until I took it off this afternoon. I saw a YouTube video that showed the whole unit sliding in and out to engage the dogs. Motor end supported on rods mounted into the end of the table but still able to slide along with the clutch and drive dog as one unit. Seemed a simple method.
Dean
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1st June 2013, 07:41 AM #4SENIOR MEMBER
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Hi Dean,
On the Jones and Shipman camelback drill in the blacksmiths shop at work I rebuilt the clutch using clutch plates from tractor PTO shafts. They come in a heap of different sizes and work a treat.
I took some pics but can't find them
Phil
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1st June 2013, 10:30 AM #5
You would have to enlighten me in relation to these clutches. Don't worry tho I will look them up. In my life I have had a bit to do with tractors off and on but have never operated one with the said clutches. All been older units. I do recall pictures of a clutch type setup that I did not look at closely. While I am pecking/dribling here I remember we have an implement brochure sitting on the table.
Anyway I will investigate this matter.
Dean
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1st June 2013, 11:36 AM #6.
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I'm interested in this. Before the 13 arrived with its power fed X and Z, I used to dream about having power feed on the little Hercus No.O. Even progressed to building a Jaycar kit speed controller for the windscreen wiper motor I planned to use. Progress stopped abruptly when smoke emanated from one of the components on the circuit board. Probably an issue of polarity.
What are you planning to use for a motor Dean?
And Phil, any chance of a beginner's primer on PTO clutches. I'm a city boy.
BT
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1st June 2013, 08:58 PM #7
Bob all the information about my components are discussed in the thread https://www.woodworkforums.com/f65/po...-drill-163501/. There is quite a bit of information there but the motor is first mentioned on page 4, Post #55. It came from EBay (of course) and I just checked and there are some still available. About $65 including postage from US.
The speed controller I bought is the one in the link on Page 4, Post #58.
I have Morrisman to thank for finding these 2 items.
The power supply discussion starts page 5, Post #69. I found these myself by researching. This is what I bought X 2 to get 24volts. Dell 00H694 Poweredge Server 2650 500W PSU DPS 500CB PE | eBay. Mine cost about $24 all up including postage. Any decent PC power supplies will do but the directions to connect these in series was available on the internet. If you do not want to play around with the innards of a power supply then you may have trouble finding a 24v power supply.
It is simple to convert and only 1 of the supplies need to be converted. It is only the DC side that needs changing, not the AC. If anyone is interested let me know and I will find the links and give assistance myself. There are some wrong instructions out there. If you are not familiar with electricity check with me or someone who knows about it. All that needs doing is to isolate the negative terminal of 1 PS from the case as the +ve input from the first PS goes in the Neg terminal of the second PS which would be earthed to case and so short PS no 1 via earth wire.
I actually started this thread just to find out what materials to make the clutch disks out of but have not had any results yet.
Dean
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1st June 2013, 09:09 PM #8
Sorry Dean, forgot the pics.....
The clutch is pretty simple, a series of sprung ball bearings in one bar, a plate with dimples in it on the other "plate" The one pictured from Mlle transfers the 2.5hp no worries, and you can make it slip by locking the moving axis. An upside is it makes a real racket, so you really know when it is slipping. Adjustment is simply by the pre-load put on the springs. Sorry only i pic, the other side of the bar with the balls in it has the holes tapped and grub screws for the pre-load. If you need a sketch of what i had in mind just let me know.
Cheers,
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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1st June 2013, 09:23 PM #9
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1st June 2013, 09:50 PM #10Member
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Check out Bareco it may give some ideas.
John
Bare Co - PTO Select Clutch
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1st June 2013, 10:00 PM #11SENIOR MEMBER
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something similar how many of us have a defunct battery operated drill lying around with a clutch iin it DIY Classroom: Get To Know Your Cordless Drill Clutch - YouTube
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1st June 2013, 10:17 PM #121915 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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1st June 2013, 10:29 PM #13SENIOR MEMBER
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keep us posted i might steal the idea for my rf 25
john
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2nd June 2013, 01:18 AM #14
Great stuff. Except that the two drills I have with that sort of clutch are still fully operational. Sigh.
I have been Drawing up my thoughts in Turbocad. I have got the individual parts drawn up in 2D but need to put them together in a side view so you can see how the components relate to each other. As I have close to a half bottle of Glenlivet in me now I am going to wait to do that for another time lol.
Dean
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2nd June 2013, 02:46 PM #15
Here is my musings of recent.
Mill Power Feed.jpg
I have not totally decided but this idea seems the easiest to implement. When it is assembled it is virtually self supporting. The motor/gearbox shaft fits into the drive shaft and is secured with a pin or grub screw. The motor/gearbox will be supported via a plate and 2 rods extending from the feed screw bearing mount holes. The plate will slide on the 2 rods. This movement will provide the engagement/disengagement of the dogs.
John that link confirmed my thoughts. Thanks. That is the same as the design above. I could use multiple clutch plates but the need for a spline or similar makes it somewhat more difficult so I have stayed with the single plate. I hope it is sufficient.
Dean