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Not Sunshine Coast............but Fraser Coast.

Greenhills formula is what you need. Bullet Weight/Length and velocity must be considered.

Usually long/heavy bullets use a tighter twist rate than light/short bullets...............then velocity...

John,

A multimeter, driven by someone who can work one, is the available testing equipment.

This process has been plagued with broken fine wires/soldered connections/dodgy stepper motors.
...

109jb,

My schematic of the FET4 board shows dip switches on all axis.

A note says "dip switches 0 0 x Hi Torque
0 1 x Wave Dir
...

john,

the motors I am currently using are 24V/.18A Uni-Polar and the power supply is 24volt so no resistors are required (?).

109jb,

"The recommended max current drive of these boards is 5...

John,

Control of FETs is via a UCN5804B.

I have replaced the "Y" control/switch as I thought it was suspect.

I have the blurb that they sent with the kit. Among it is a diagram of the board...

109jb,

I hear what you're saying.

I'm only persisting with the FET4 as it's what I've got my money sunk into. So I'm trying to make the most of it. It seems I've "bought a turkey" but, at...

bump

For those of you who are interested in accurate rifles and what it takes to create that accuracy and maintain it you need a copy of Centrefire Rifle Accuracy - Creating and Maintaining it by Bill...

fredd,

sounds like you need "Rifling Machines and Methods" by Cliff Labounty Rifling Machines And Methods | Rifle Boring

I have Bill Webbs disc etc but am likely to order Cliff's book shortly...

I bought a Stepperworld FET 4 kit with Sanyo Denki motors (50 oz) a few years back and have recently took the conversion of my RF30 mill more seriously.

The problem is that I've got no response...

Well I've now replaced the dead stepper motor on/off switch but the results are the same...............a dead Y axis output port.

I am now chasing the likelihood of it being a pin allocation for...

I have identified NSK 7903 angular contact bearings with a 17mm ID and a 30MM OD thereby allowing me to mount original handles and their associated furniture as I am taking the flashcut round of...

Chuck,

I followed this post with delight as I'm attempting to do the same conversion myself.

What brand are the 7291 angular contact bearings that you used ???

I have been unable to find...

damianpoirier,

thanks for your comments.

A local "techspert" checked the board (with a multimeter) and found that the dead port is due to a dead stepper motor on/off switch chip and I am...

Aaah spontaneity is often a problem. Perhaps a moderator can shift this post to the correct place..............if the location of my post is causing issues.

Yes my mill is a Harbour Freight 30. I...

My HF30 round column conversion has been a protracted one................I suppose that's why they call them "projects".

I bought a Stepperworld FET 4 kit with Sanyo Denki motors (50 oz) a few...

Folks,

I searched in vain for information on how to wire up my 5 wire Sanyo Denki type 103-771-18 steppers (DC 24 V, 0.18 A, 1.8 deg/step) to my Stepperworld FET4 controller (?).

The "board"...

pippin88,

I contacted linearmotionbearings2008 and a 1605 x 450mm & 1605 x 900mm with double nuts have been ordered. At a delivered price of $104.30 Aus I couldn't dither longer on the deal.
...

Robbycar,

Thanks for the intel on cnc hardware. I've been looking at linearmotionbearings2008 store on ebay and am amazed at prices for ball screws. Set of three 1605 C7 will cost me $157...

Robbycar,

Who did you get your conversion gear from ???

I'm also converting a HF30.

Are you going steppers coupled to ballscrews or cogs and belts ??

g'day Aussie zoners,

I'm on the Fraser Coast in Queensland.

I've caught this cnc bug and am amazed at some of the stuff these guys get up to.

So far I've got a HF30 Mill Drill (long column),...