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Thread: Table traverse for Chinese mill.
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22nd May 2014, 08:31 AM #1
Table traverse for Chinese mill.
Hi Guys,
My Chinese mill does not have a motorised table traverse ! Its a pain, in more ways than one, at times to stand there winding the table back and forth. So I thought that I would see if I could design and build one from scratch. With this in mind I decided to have a trawl around my local scrapyards for something to use and came across a suitable car windscreen wiper motor. I found this one from a wrecked Nissan Micra. I grabbed this one because it was very easy to get it off the chassis bulkhead. Four hex head bolts and it fell out and the power connections were a very convenient plug and socket attached to the back of the gearbox. At this point I didn't know what condition it was in, only that it was quite clean with only a little rust on the motor case where the paint had flaked off.
When I chose it I didn't realise that it was a two speed motor, but on testing it, it soon became obvious. It also had an intermittent wipe switch built into the gearbox which confused me at first. Anyway it runs quietly in either direction at both speed settings.
The photographs show two views of the motor and gearbox.Best Regards:
Baron J.
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22nd May 2014, 10:27 AM #2Most Valued Member
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Hi Baron,
Some of these motors don't take running backwards very well, the thrust bearings on the worm are designed for it. If have a search there are at least a couple of guys here have built this sort of thing.
Are you sure the intermittent isnt "park"?
You'll enjoy powerfeed
Stuart
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22nd May 2014, 11:57 AM #3
I have designed one. It will use a 14A, 24v geared motor. Powered by 2 computer power supplies and controlled with an electronic variable control (PWM?). A bit more expensive,but vastly better power and control.
I am on my phone. I will find the thread tonight.
Dean
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22nd May 2014, 02:20 PM #4Most Valued Member
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Dean, looking forward to seeing your set up.
Kryn
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22nd May 2014, 08:22 PM #5
motor
Yes I used a XF Falcon wiper motor. On my DM 45 mill drill it generally does what I need it to , but as Stuart noted, when in reverse the worm/gear tends to chatter above a certain RPM . It is a little annoying because ideally, you want a faster reverse traverse ,for returning the table .
The speed control PWM controllers are easily found on EBAY . Mike
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22nd May 2014, 08:24 PM #6
Didn't blu recently post his power feed setup? Can't remember where though, maybe the latest project thread?
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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22nd May 2014, 08:41 PM #7
So am I Kryn, So am I. I have had to put it on hold due to a lack of a working lathe. If you have seen my "New Lathe" thread and the "VFD Circuit Diagram Question" thread, you will know that my lathe is now up and running after nearly 2 years (11/07/12). My old Nuttall was collected on the last day of 2013 so I have been latheless for that time.
I am taking next week off and I might be able to get some work done on it, but I might not too.
Some links to threads on the Forum. These are only a couple I have been involved in.
http://www.woodworkforums.com/showthread.php?t=171862&highlight=mill+feed
http://www.woodworkforums.com/f65/power-feed-mill-drill-163501/
I think all the information about my design is in these. Any questions just yell out.
Dean
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22nd May 2014, 09:28 PM #8
I built just such a table drive for my Cash mill about 22 years ago. Still working well.
It's 12V wiper motor and I run it with a dimmer switch on the 240V side of a 24V transformer and rectifier. So my rapids are actually 24V but they don't overheat the motor because they only take a few seconds.
I'm about to modify the setup (as described elsewhere) with controls in my new mill remote control panel.
I also came across a newly designed DC speed controller (in the mail to me now) which allows setting the maximum current (torque) and speed (by PWM). The clever part of this design is that it monitors the motor speed (electric feedback from the armature in between pulses somehow) and is supposed to maintain the set speed irrespective of load, up to the maximum current set. We'll see how that works - servo function without servo drive....
For my rapids I have momentary push buttons which - via relays - bypass the speed controller and just feed the motor the full 24 V again.
The mechanial drive is via toothed belt to the table screw.Cheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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22nd May 2014, 11:04 PM #9
Got a link to this controller Joe?
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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23rd May 2014, 12:39 AM #10
Some years back an article was in MEW that shows how to build one. I have it somewhere ...I'll check in the morning if you need it
PeteBoycott Shampoo!!
Demand Real Poo!
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23rd May 2014, 12:49 AM #11
Hi Stuart,
I have now ripped all the switches out, but thinking about it, yes, your right. The motor has to stop after one revolution, then the timer just bypasses the switch long enough to start the motor running again, then it continues until the switch opens.
As it stands now I have just three wires. Black = common, Red = slow and Blue = fast.Best Regards:
Baron J.
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23rd May 2014, 12:55 AM #12Best Regards:
Baron J.
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23rd May 2014, 01:07 AM #13
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23rd May 2014, 09:27 AM #14
Me too!
The one I bought is from Germany and no link, sorry.
When it gets here I'll know more.
Cheers,
JoeCheers, Joe
retired - less energy, more time to contemplate projects and more shed time....
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23rd May 2014, 10:59 AM #15
Yes 14 amps. "Ouch"? I prefer to think "Yum". Lots of power. Power supply cost about $25 and can put out 42 amps at 24v together. The PWM $10. The biggest problem is to find a suitable motor. I believe that this feed unit will far outperform a wiper motor. Total cost about $90.
Dean