mikeh
New Member
Posts: 6
|
Post by mikeh on Nov 30, 2019 16:23:51 GMT
I'm trying to see if it is possible to reverse the direction of rotation of the belt on my PE, in the hope that it might enable me to a) get a better cutting burr when I'm sharpening scrapers, and b) get a finer finish on some other tools
I started by trying to identify the exact model of the motor to see if this might be possible by rewiring? The make on my PE is FIR ELETTROMECCANICA (obviously Italian) and the model is TYPE 3640 1400 ..... PBL20278. I can't find this model on the elettromeccanica website (or indeed by just doing a google search of MOTOR TYPE 2640 1400, or MOTOR PBL20278 or other combinations).
Some of the Elettromeccanica motors on their website do allow you to change from anticlockwise to clockwise by altering the wiring slightly across some of the 6-way terminals in the junction box on top of the motor, but when I opened up my junction box, there aren't such terminals - and the wires from the capacitor leads go directly into the windings of the motor coils, as do the wires from the power on/off switch.
So my current suspicion is that it might not be possible without drastic measures such as dismantling the whole thing and seeing if the motor could be mounted at the opposite side of the belt (a bit drastic), or by replacing the motor with a reversible one (a bit silly - might as well just buy the competitive Axminster product which does have a reversing option and also permits the use of Tormek jigs...)
So, before I give up entirely, or contacting Sorby directly, I would be grateful for any ideas anyone might have... Many thanks and best wishes to all on this forum Mike
|
|
|
Post by Pete on Dec 1, 2019 10:05:53 GMT
Hi Mike, this one is a direct conversation with Sorby I think.
|
|
|
Post by francis on Dec 2, 2019 6:47:34 GMT
For my scrapers what I have made is a block which sits on the regular platform so that I can invert the scraper and sharpen it with the belt going "up" the slope of the scraper towards the burr
I had thought about the reverse motor thing but decided its was too complicated
I'll post a picture later
|
|
ola
New Member
Posts: 7
|
Post by ola on Dec 2, 2019 12:35:10 GMT
Not really answer to your question, but I assume you seen my thread regarding modifying the PE so you can run tormek jigs on it? robert-sorby.freeforums.net/thread/182/quick-make-accomodate-tormek-styleUsing this jig makes the belt go away from the edge, so instead of reversing the belt direction the jig location is what changes the direction. Won't work for scrapers but really good for chisels and plane irons.
|
|
mikeh
New Member
Posts: 6
|
Post by mikeh on Dec 3, 2019 14:10:04 GMT
Hi Ola Yes I had seen your mod in the past but many thanks for reminding me. Looks excellent.
It might even work for scrapers since I sharpen mine for negative rake (60" and 20") so maybe the angles would be OK in the Tormek Jig
I may well try to make one if I can sharpen up my non-existent metalworking skills;=))
Meanwhile, I sent a question to Sorby so I will update the forum if and when they reply Cheers all, Mike
|
|
|
Post by Clive Brooks on Dec 4, 2019 10:19:03 GMT
The simple but very effective sounding addition that Francis has devised to allow a burr to be created on the top edge sounds exactly what you are looking for Mikeh.
With extra engineering abilities the modification that Ola has done is a wonderful adaption and shows the brilliant ingenuity of our customers around the world.
As a production manufacturer we have produced an all round sharpening system suitable to a vast majority of our customers...but it is you guys that go above and beyond to allow our great machine to suit your own personal requirements...I raise my hat to you all
|
|
fred
New Member
Posts: 8
|
Post by fred on Feb 21, 2020 19:03:04 GMT
Hi, I'm new to the forum and like most have purchased a PE. I would also like to be able to reverse the machines motor, but first before attempting to do so I have a question I would like to ask RS. Is any over temperature protection built into the end windings?
|
|
|
Post by Pete on Feb 21, 2020 21:53:31 GMT
Hi Fred Nobody has managed to reverse the motor on the PE, the suggestion is to add a Tormek jig compatible mod that works from the top of the PE effectively reversing the action but not the motor. Tormek jig mod link
|
|
fred
New Member
Posts: 8
|
Post by fred on Feb 22, 2020 20:34:31 GMT
Thank you for the sage advice Pete, I very much like the mod. However I don't fancy forking out £50 for the jig or the working position. So I spent the day doing something else. Do you like my choppa?
|
|
|
Post by Pete on Feb 22, 2020 22:32:30 GMT
? Those sparks indicate the belt is going in reverse... have you achieved it? If so how?
|
|
fred
New Member
Posts: 8
|
Post by fred on Feb 23, 2020 15:44:51 GMT
Firstly I would like to advise anyone without the necessary experience and access to the required tools and materials NOT to attempt reconfiguration of the motor winding. I imagine RS would be none too happy having their technical file scrutinised due to a speshal diy enthusiast like me being found dead slumped over a PE. To remove any liability I have appropriately labelled the machine.
The motor reversing switch is installed in the side of the terminal box. It came from Hawker Sidley liquidation in the 90's "keep anything long enough ". Open motor surgery.
Quite simply, one of the blue wires needs to connected to either one of the winding wires connected to the black wire. Red is okay.
|
|
fred
New Member
Posts: 8
|
Post by fred on Feb 23, 2020 15:55:50 GMT
Glyptal goo lovely lovely lovely.
I found grinding dust in the drive end bearing recess so I fashioned a felt shaft wiper.
|
|
|
Post by francis on Feb 23, 2020 19:26:18 GMT
Great post Fred - not that I will be attempting this but given you used a Hawker Siddeley switch - can we say that when the belt stops and starts going backwards we should call this "VIFing" !!!!!!!!! (for those who can remember the Harrier Jump Jet could VIF - vectoring in flight - basically making the aircraft jump in a vertical direction which allowed the aircraft pursing you to fly right past) www.youtube.com/watch?v=8UE9i82Kc_Yand other videos on Your Tube
|
|
fred
New Member
Posts: 8
|
Post by fred on Feb 24, 2020 16:11:55 GMT
Hi francis,
By all means call it that and thank you for a positive reply. Most that are unfortunate enough to encounter my work usually respond with expletives.
I would like to add to my previous post the importance of doing insulation resistance tests after reassembly. Test between windings, then between each winding and frame. Also check earth continuity between the frame and plug. Although not mandatory a plug in 30mA RCD should be given consideration, given that the only protection supplied with the machine is a 13A fuse.
|
|
|
Post by Pete on Feb 24, 2020 19:44:22 GMT
I think the mod exceeds my comfort level but only because I don't need it... But thank you for the info Fred, with appropriate cautionary notes. As a forum moderator I must just state for the record that we in no way encourage people to go around removing switches from aircraft!
|
|