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| slowcoach:
Hi All, Having just converted my Harrison L5 to run off a digital phase converter with remote speed control (I know, posh init ::)) I had the problem of knowing what the exact speed the lathe was running at when using the speed control (serves you right, you flash git, I here you all cry!) :scratch: A mate of mine (lucky so and so) had obtained a tachometer from a local power station, once used to measure turbine speeds I guess, he fitted it to his Brown & Sharp lathe and it works beautifully. Not being so jammie like my mate ::), I decided to search the good old internet to find a tacho that would suite my requirements. I found a few, but they were a bit on the expensive side, being a Yorkshireman I wanted something for nowt :ddb: Anyways to cut the story short I found a little gem of a website that described a simple tachometer to suite my needs. I placed an order for the listed parts and set to work building one from the excellent instructions provided on the website. The circuit is built on stripboard, so construction is easy. I opted for the optical sensor that uses a reflective strip to pulse off. I connected the power supply and fired it up and it worked, no magic smoke :bugeye: I lashed it up to my Harrison and hey presto a digital tacho, reading out the spindle speed to me, fantastic :thumbup: So I built another one for my bandsaw! So I thought I would share my find with you guys, call it a early Christmas present. I cannot take any credit for this unit as I did not design it, some bloke called Les did and what a great job he's done :clap: :clap:. I would of posted it earlier, but I lost the link to the site thanks to a hardrive failure :bang: It took me months of searching to find it again, but here it is. http://myweb.tiscali.co.uk/leshobbies/leshobbies/Tach%20project.htm Here's a few pictures of the unit I built in its box. and one of the sensor and back of unit showing the on/off switch, sensor socket and power socket Poor picture of the finished board Cheers and Merry Christmas Rob :thumbup: |
| andyf:
Thanks for showing that, Rob. I use cycle speedos, but the magnet only gives them a signal once per revolution. Taking as many readings per rev as there are teeth on your spindle gear sounds much better. Is it reasonably quick to update itself when you change speed? All the best, Andy |
| Jonny:
Thanks Rob got two Harrisons, but will build one of these for the M300 that goes to 2500 rpm. Have you the advanced digital the one with 420V outputs or the 220V outputs. Just returned, well 8 days ago a 220V 3ph output digi but need the plug and play 5.5hp 420V 3ph output for above M300. Just slapping a 3 axis DRO on two of which are the magnetic type. |
| slowcoach:
--- Quote from: andyf on December 23, 2010, 04:23:23 PM ---Thanks for showing that, Rob. I use cycle speedos, but the magnet only gives them a signal once per revolution. Taking as many readings per rev as there are teeth on your spindle gear sounds much better. Is it reasonably quick to update itself when you change speed? All the best, Andy --- End quote --- Hi Andy, my pleasure (Rob Willson has been poking me to post this for a while :poke:), Its pretty fast at updating. Cheers Rob --- Quote from: Jonny on December 23, 2010, 05:24:41 PM ---Thanks Rob got two Harrisons, but will build one of these for the M300 that goes to 2500 rpm. Have you the advanced digital the one with 420V outputs or the 220V outputs. Just returned, well 8 days ago a 220V 3ph output digi but need the plug and play 5.5hp 420V 3ph output for above M300. Just slapping a 3 axis DRO on two of which are the magnetic type. --- End quote --- Hi Jonny, I've got the advanced one 440v output, would'nt be without it now! Have fun! Rob :thumbup: |
| j45on:
Thanks for sharing :thumbup: I think I will make one for my mill :dremel: :nrocks: |
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