How to make this?

[RWD3M]

Sooo, is there anything fundamentally wrong with the cutter I was looking at or the company from whom I was thinking of buying from?

 

[dave h 2]

RWD3M,
You only need 4 metric or 4 imperial collets for that mil which you have. I'm sure you are aware that the the Clarkson systems only need a light snugging up with the spanner .
On the other hand the ER system needs a bigger spanner than then one provided to grip properly or be tightened by a gorilla.
There are slot drills and then there are slot drills that aren't. Your new one has a centre point on the cutting end it may need to follow a 1/4" drill hole to cut properly it may also be OK .
Some slot drills have no centre on the cutting end, but if you look one blade is longer than the other, these will plunge regardless.

I wouldn't plunge bench drill style , used the fine feed and snug up all way locks things can get a little snatchy

 

[RWD3M]

RWD3M,
You only need 4 metric or 4 imperial collets for that mil which you have. I'm sure you are aware that the the Clarkson systems only need a light snugging up with the spanner .
On the other hand the ER system needs a bigger spanner than then one provided to grip properly or be tightened by a gorilla.
There are slot drills and then there are slot drills that aren't. Your new one has a centre point on the cutting end it may need to follow a 1/4" drill hole to cut properly it may also be OK .
Some slot drills have no centre on the cutting end, but if you look one blade is longer than the other, these will plunge regardless.

I wouldn't plunge bench drill style , used the fine feed and snug up all way locks things can get a little snatchy

Thanks Dave, that's helpful.

 

[addjunkie]

Sooo, is there anything fundamentally wrong with the cutter I was looking at or the company from whom I was thinking of buying from?

Itll do, I find RDG better to be honest, Cutwel better quality

 

[RWD3M]

Itll do, I find RDG better to be honest, Cutwel better quality

Thanks. I have bought stuff off them before, I'll give them a try too.

 

[m_c]

I rarely use Chronos, as their dispatch times used to be hopeless. Order something, and they might dispatch it 3 days later, but I've not used them for years.
RDG were always cheap and cheerful.

Cutwel are an industrial supplier, so are more expensive, but you know what you're getting and that it'll be sent when they say they will.

Arc were always the good compromise, but sadly no longer exist.

 

[RWD3M]

I rarely use Chronos, as their dispatch times used to be hopeless. Order something, and they might dispatch it 3 days later, but I've not used them for years.
RDG were always cheap and cheerful.

Cutwel are an industrial supplier, so are more expensive, but you know what you're getting and that it'll be sent when they say they will.

Arc were always the good compromise, but sadly no longer exist.

Chronos and RDG sell cheap tat in my opinion.

APT are far better for tooling

Thanks guys, I'll give both of these a look.

 

[RWD3M]

Hi all,

Tooling (Clarkson Posilock) arrived late yesterday so I now have a set of 4 x Imperial collets, 4 x Metric collets and a selection of end mills ranging from 6mm - 12mm and 3/16" - 1/2".

What I'd like some advice on is what speeds I should be using for cutting slots in steel on my little EMCO clone?

Cheers,

 

[addjunkie]

According to google 764 rpm with a 1/2” cutter and mild steel. Id probably go a bit slower, but the type of tool can have an effect too.

Step 1: Find Your Surface Feet per Minute (SFM)

• Look up the recommended SFM for your specific workpiece material (e.g., mild steel, aluminum) in a tool catalog or machining handbook.

Step 2: Calculate Spindle Speed (RPM)

• Formula: RPM = (SFM × 3.82) / Diameter (in).
• Example: For mild steel (SFM = 100) with a 0.5-inch endmill: RPM = (100 × 3.82) / 0.5 = 764 RPM.
• Manual Tip: For manual machines, you can use RPM = (SFM × 4) / Diameter for a quick estimate.

Step 3: Determine Feed Per Tooth (FPT) & Chip Load

• Look up the recommended Chip Load (or Feed Per Tooth, FPT) for your tool and material in a chart.

Step 4: Calculate Feed Rate (IPM - Inches Per Minute)

• Formula: Feed Rate (IPM) = RPM × FPT (Chip Load) × Number of Teeth.
• Example: If RPM is 764, FPT is 0.005", and you have 2 teeth: IPM = 764 × 0.005 × 2 = 7.64 IPM.

 

[RWD3M]

According to google 764 rpm with a 1/2” cutter and mild steel. Id probably go a bit slower, but the type of tool can have an effect too.

Step 1: Find Your Surface Feet per Minute (SFM)

• Look up the recommended SFM for your specific workpiece material (e.g., mild steel, aluminum) in a tool catalog or machining handbook.

Step 2: Calculate Spindle Speed (RPM)

• Formula: RPM = (SFM × 3.82) / Diameter (in).
• Example: For mild steel (SFM = 100) with a 0.5-inch endmill: RPM = (100 × 3.82) / 0.5 = 764 RPM.
• Manual Tip: For manual machines, you can use RPM = (SFM × 4) / Diameter for a quick estimate.

Step 3: Determine Feed Per Tooth (FPT) & Chip Load

• Look up the recommended Chip Load (or Feed Per Tooth, FPT) for your tool and material in a chart.

Step 4: Calculate Feed Rate (IPM - Inches Per Minute)

• Formula: Feed Rate (IPM) = RPM × FPT (Chip Load) × Number of Teeth.
• Example: If RPM is 764, FPT is 0.005", and you have 2 teeth: IPM = 764 × 0.005 × 2 = 7.64 IPM.

Thanks for this. I'll read it properly now over a coffee!

 

[addjunkie]

Thanks for this. I'll read it properly now over

Id suggest you buy an old style apprentice type book on lathe and milling!

 

[MattF]

I rarely use Chronos, as their dispatch times used to be hopeless. Order something, and they might dispatch it 3 days later, but I've not used them for years.
RDG were always cheap and cheerful.

I've never had a problem with either company. They both tend to sell the same generic import gear.

 

[RWD3M]

Id suggest you buy an old style apprentice type book on lathe and milling!

Good idea!

 

[Robotstar5]

Id suggest you buy an old style apprentice type book on lathe and milling!

I've still got all my apprentice books from the 70's including one on machining processes.

 

[addjunkie]

I've still got all my apprentice books from the 70's including one on machining processes.

View attachment 526257

View attachment 526258

Yep I still have a couple of mine too, but got shot of all the books of big sums, as I didnt need so many door stops.

 

[Robotstar5]

Yep I still have a couple of mine too, but got shot of all the books of big sums, as I didnt need so many door stops.

Just checked and I still have 'mathematics for electrical and telecommunication technicians' on the bookshelf

 

[addjunkie]

Just checked and I still have 'mathematics for electrical and telecommunication technicians' on the bookshelf

Ideal for any insomniac!

 

[RWD3M]

It's all done!

For those who may be interested in the milling, I just guessed it and it seemed to work.

A few obligatory pics:

Mock up.

Spring loaded axles. These hold the plate on the top about 6mm clear of the ramp bed and the whole thing rides very smoothly along the full length of the ramp.

Tacked up.

Checked for fit.

Welded up.

Lowered into position.

And doing what it was designed for.