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The table is home made using a 36:1 worm and wheel. The wheel is about 2 3/4 inch diameter and the motor is 60oz in. The actual table top depends upon what I want to do but at present has a 5 inch 4...

I use a 5 volt 1 amp motor at 19 volts and 1 amp setting on the driver with a 36:1 worm ration with no problems.
John.

I think it is more a case of steps per table turn that is the setting required,
I use a 36:1 ratio although with half stepping however there is a maximum number of steps per turn of table...

Change your belt drive to a different ratio, 90:40 and you should get back to the original setting.
John.

Nothing spectacular to be seen,
The divider circuit is underneath the display and attached by a row of pins soldered to the display and which push into a row of sockets chopped from a DIL socket....

Hi Steve,
At long last it is Alive!!!! It has only taken 5 years along with one Fried Display and Chip to get there, now it only needs a bit of tidying up of the wiring around the motor to look...

I'm afraid I am slightly confused with this 4000 steps/turn using a 40:1 gear ratio and 200 step motor. Surely 40 times 200 motor steps equals 8000 steps per turn of the table? Does that not mean...

Not used one for 12 years now,
Try waggling the long vertical lever on the front of the head.
I seem to remember it reversed the feed with feed disengaged when vertical.
Have they changed design...

Not knowing where you are in UK the two I know other than places such as RS or Farnell are

Airlink transformers in Harlow
01279 431865
Transformer Manufacturer UK - Airlink Transformers - Home...

Hello again Steve,
A thought occurred to me about the uses for your controller. I searched the documentation as best I could but although and found there is a continuous running command. Is it...

Hi Steve,
Here on the edge of the East Angular Fens we may sometimes get a little muddled. Buzzing around in my head was something about only being able to divide in multiples of two anyway you have...

Steve,
I can think of nobody bettwer qualified to answer my question so quickly. Now I have to decide which way to jump, at the moment I cannot think of any odd divisions needing other than those...

OK second attempt at posting, first has vanished into Cyberspace.
Firstly may I add my thanks to Steve for posting all the details for building this piece of equipment. Next I would like to ask if...

I have always understood the parallel port is a true machine control port. I suppose it must cost a bit more for the 25 pin connector than the USB both for computer manufacturers or printer makers so...

I used a variation of an LED flasher to generate steps from a 5 volt supply,
Direction from another switch on the supply and used a basic controller card kit for a bi polar motor that accepts...

I use a perfectly smooth power source,
No power surges spikes nor any unwanted happenings. It supplies 100 Amps for short periods of time, does not need any cooling system and with reasonable...

Even if the strip moves for the table to stick in the same position at one end of the travel to me indicates a tapered Y axis dovetail on whichever part does not have the gib strip fitted.
John.

Was just awoken by a postal delivery from Marchant Dice,
I ordered over the phone Friday morning and it was despatched the same day.
No problems at all with this company but note I...

Perhaps time for us to petition the PCmakers to reinstate the 'machine controller port' on their products.
Cannot cost them much to include one on the mother board as they did in days gone by. ...

Have a look at
http://www.otocoup.com/index_e.htm
You may get some ideas there on a similar sized 'vertical' machine.
John (UK)

Back in 1969 I used one of these variators,
Sadly not a very good photo having been scanned from a fading magazine. Basically it was a bracket with a pivot at the bottom, a locking knob at the top...

My reason for converting to CNC at home seems to be different to most folks. All I want is repeatability for when I need to make a part after some time since the previous one. Speed for me is not...

Many years ago there was such or similar type of engine described in the Model Engineer magazine here in UK. It weas described as an explosive steam engine and there were thoughts of it being...

Same problem here in UK,
Different colour machine but a similar problem. With mine the eccentric pin that is supposed to move in a slot in the gear fork was not close enough and when rotated jumped...

Basically unscrew the drawbar about 2 turns and tap the top with a hammer. I support my quill by hand rather than clamp it tight in the faint hopes I will not damage the spindle bearings too much....

Hi John,
I'm another UK John from just South of Peterborough where the highest point for miles is the East Coast Main Line railway track.
John.

Many years ago I cut some cylinder blocks for a 6 inch scale steam truckfrom a similar sized piece of cast iron. I chain drilled using a hand held electric drill and a half inch drill. After drilling...

Hi Kev,
I use the same boards and found them pretty much bomb proof as I found when I put a capacitor in the wrong way round with explosive results, a new cap got the board working again with no...

If it is now confession time regarding what we should not do at home here is my contribution.
Many years ago I had a Messerschmidt Bubble car and needed to get the starter/generator rotor off the...

I thought my motors were getting too hot so made a shroud to fit round them with a PC power supply fan to push air past the casings. Barely get warm now. I am using Nema 23 motors 5 volt, 1 amp per...