Member postings for Dave Harding 1

The details on heat sink label are.

DC Motor Speed Control.

Model JYMC-220A-l. Input 230VAC-50/60 HZ. Output 0-180VCD. Rated 6.0. ADV.

Yanzhou Jiayi Mechano-electronics institute. High pot tested.

It's off my lathe the speed control is u/s. The motor just runs flat out.

I think I have sussed it. Any one know were I can get one of these boards. OOps double post.

Edited By Dave Harding 1 on 20/09/2016 19:47:23

It does not matter. posting pictures is to much of a chew on.

I contacted SPG the company I bought it from. If I send the boards to them they will test them and advise. Sounds fair enough to me. At least I will know for definite if one or both are goosed. Before I start throwing money at it. It sounds like they keep spares.

Edited By Dave Harding 1 on 19/08/2016 19:29:41

Thanks I will remove the boards and go from there. The wiring diagram is useless.

It's not the motor I have had it checked out and it's OK. So it must be some thing else may be the board.

I was running at a fairly low speed I don't know exactly my read out stopped working. The material is not stainless not sure what it is really it seemed to be taking a age to machine. I was taking relatively small cuts. I was at it for quite awhile I had machined one end then turned it round to reduce the OD from probably 20mm down to 6.5 mm over a 4" length so it was running a while. In hindsight reading some of your replies I should have been running at a higher speed. It might well be the board that is fried. There are no burn marks on either of the boards so nothing obvious.

My lathe is the one the link takes you to in a previous post. I purchased it from SPG.http://www.model-engineer.co.uk/albums/member_photo.asp?a=30894&p=500175

I was turning a piece of bar stock down to 6.5mm. The lathe was not running particularly fast. I was using a carbide.

The ba rstock was of unknown origin and it seemed to be taking a bit of cutting. Things were getting a bit warm I noticed smoke coming from the area were the motor is. before I could stop it there was a bang and everything stopped. I suppose it could of been the board or the motor. I'm taking the motor into work to morrow hope fully they can test it and tell me if its goosed. I am new to this so I may be a bit vague in my description. If it is the motor what are my options could I beef it up or is there a better way to power it. If its a board I guess its going to be pricey.

Ill know better to morrow I hope.

Edited By Dave Harding 1 on 14/08/2016 19:11:17

I think I have burnt out my motor things were getting hot then smoke started coming out of the casing before I could hit the stop button something went bang and the lathe stopped. Are they prone to killing motors. Were do I get a replacement.

Yep I have stripped the plastic drive gear wheel

Looks like I'm stalled any way. When I went back to the job to day it looks like I have stripped the teeth of the gear train on my x2 mill.

Looks like a strip down.

Do you get the same problem with silver steel or is it just stainless. The bits I'm making don't need to be stainless.

I tried to drill a couple of holes in 316 10mm thick stainless. I want to tap the holes to accept a M4 grub screw. I ended up with a broken drill snapped off in one hole. The other hole I gave up after blunting two drills. I'm holding the work in a milling vice and using a mill to try and drill the holes. Would I be better of using a end mill or a slot drill.

Unfortunately my skill level does not run to that sort of remedial action. I'm going to take it in to work to morrow and let the machinists/toolmakers have a look at it but Ill probably just give up on the project and sell the chuck Ill probably include the back plate for free. Some one with more know how can probably sort it out.

Unfortunately the run out on the chuck once I got it installed is terrible. I have had to remove it and refit the three jaw. I will stick with my three jaw for now until I decide what my next move is.

Just a update on the Chester machine tools ER40 collet chuck saga. It seems they don't have in stock the ER40 100mm by 72mm chuck or they don't stock that size because once again they sent me a 125mm x 95mm chuck. I phoned them and after a bit of discussion they offered a solution. They sent me free of charge a back plate so I could fit the 125mm chuck to my 100mm spindle.

So a result I have a working ER40 collet chuck thanks to the people at Chester tools.

I'm beginning to think its more to do with the way the lathe is set up than the actual tools etc. I noticed that the tool post was moving slightly when looking down on it. I had a good tug on the cross slide and saddle etc. Thee is a lot of play/slogger. I took the carriage off and reset everything then put it back together it took a few attempts to get it some were near. I adjusted the cross slide and started again. Using a honed HSS cutter things are looking better. The cross slide still needs some attention and I'm struggling to get rid of back lash. But we will see what happens.

We don't have these problems with the Hardinge lathe at work it just works. LOL. These Chinese lathes take some fettling.

I bought some stainless 303 and some bright steel EN1A rounds to play with over the week end from M Machine.

A total disaster no matter what speed and feed carbide HSS it makes no difference the finish is terrible. I give up I'm going to get the guys at work to machine the project for me. Enough is enough its just a waste of my time.

I can't wait to get my hands on it as soon as it arrives I'll get it fitted. I have a few projects I'm keen get started on.