Member postings for Mervyn Karwot

The controller I have has no name on it and the label says "DC9-60v Motor Controller20A" It is a pulse width controller with off, forward and reverse switch. I bought it a few months ago from an eBay seller in Hong Kong. It was working fine when I connected the motor to the test battery. It cost around £10.

The DC power supply I have just bought from Banggood is "AC 110/220v to DC 0-60V 8A 480W Adjustable Regulated Switch Power Supply"

My motor works with 1 to 4 ratio polybelt pulleys from the motor to the z axis handwheel. I have seen this setup on the internet before.

I hope this helps Ian.

Mervyn

Thanks again for all the information and links. I have decided to get a 60volt DC supply and I have purchased a 0 to 60 volt adjustable supply direct from China through Banggood. Before anyone says anything, I have bought many workshop items direct from China through Aliexpress and Banggood and all have been high quality items. This one cost £37 with free postage but there could be a customs surcharge. I will get it in a few weeks and I will let you know the results

Mervyn

Thanks Ian, I'll keep that in mind if plan A doesn't work.

Super thanks Dave for the theory and the link. As you can see, I'm not well informed about electric motors but your comments make things more clear and confirm that a 60volt supply would be ideal. I have a 60v Pulse Width Modulator with Reverser and this would make the system more controllable. Are 60v supplies much more expensive than 48volt systems? I couldn't find much on the web, even from China.

I only tried the leisure battery for a few seconds just to see if it worked before buying a proper power supply. I wouldn't run it like that for long. Perhaps it should be cruelty to batteries!!!

Mervyn

Thanks again for your ideas. I have now tested it and the head moves up and down.

The motor is actually 1 HP continuous and it moves the T100 treadmill from 1km/hr to 10km/hr on a 4% slope with a person weighing up to 90kgs It has a polybelt drive with a ratio similar to mine, about 1 to 4.

I connected it to a 12v leisure battery and with a pulse modulated controller and reverser, it can raise and lower the head. Now, as Nigel said the speed is dependent on the voltage and the torque on the current so I will look for a 60 volt DC or larger power unit.

I have read what you said that other motors are better but that is what I have and I am on a budget. If this doesn't work, I will be moving the head manually as I have done in the past.

Thanks to everyone, Mervyn

Thanks once again for your information. I would prefer a direct drive motor rather than geared as I can still use the hand wheel manually. The pulley on the motor is smaller than on the hand wheel so the motor will turn several times for one turn of the hand wheel.

Thanks Nigel for your information. A stepper motor would be better but I am on a budget and I don't need such a fine motion as you do. I just want to be able to raise and lower the head without turning the hand wheel hundreds of times. I am trying to find out what voltage I require so that I don't waste money on a wrong power source.

Unfortunately, I cannot get a photo put up on this page as there seems to be a problem finding the album.

Mervyn

Thanks everyone for your information. I cannot post a photo on the forum as the "insert image" cannot find an album on my computer. The motor as AdrianR says has red black and earth wires and I have tested it with a 12v DC model railway controller. It goes forward and backwards OK but without any great power.

I was wondering if H2 was 2Horse Power and 25 was 25amp

Then

2 x 746watts = 1492watts

and 1492watts divided by 25amp = 60volts DC

Mervyn

I have a DC motor from a PremierFit T100 treadmill which will be used to lift and lower the head of my FB2 mill drill. The numbers on the label are H2-25-4100 and there is no other information apart from a serial number. I cannot find any details about the motor on PremierFit brochures on the internet. Can anyone tell me the power supply I require to run this motor? Many thanks.

Hi Tom,

I purchased a 100mm versatile vice from Arc Eurotrade at the beginning of December. When it arrived, the handle would not fit and the metal was chewed and forced out by 4mm at the thrust bearing. I contacted Ian, expecting a replacement but he said that “they were all like that” and he decided to pay for return postage and give me my money back.

Unfortunately, I could not find another similar vice in the UK so I decided to import directly from China through Alibaba (a Far East Amazon). I found a company called Olima who make precision work holding devices and although they sell this type of vice in batches of 10s, they sold me one, the QM100N Precision Vice. We kept in contact through Alibaba until it arrived within the timescale and although I paid more than the Arc Eurotrade vice, I am thoroughly delighted with it. The vice cost around £120 including express shipping to my house near Glasgow and an additional £31.49 for import duty, VAT and Alibaba fee. I now have a beautifully made, precision milling vice with accu-lock anti lift device which works perfectly.

I can set it up on my FB2 milling machine with a metal square along the long edge and the jaws are spot on. I could only measure 0.001” lift in the moving jaw when clamping work and all surfaces are truly flat.

I have no connection with Olima other than a very satisfied customer and I have sent them a message through Alibaba about the fantastic quality of this product for the price paid.

Mervyn

Hi, B.Reilly,

I sent you an e-mail with my contact details this afternoon. Neil forwarded your e-mail to me.

Looking forward to hearing from you.

Mervyn