Big Gear Cutters

[bob]

This one is #1-8DP I may have a bunch more similar at the other shop if there is any interest at $1.25 per pound I will check
Bob

 

[4GSR]

I'll buy it.

Send me a PM on what I owe you for this.

 

[eKretz]

Also interested if you have others.

 

[bob]

I will not be over there for a few days

 

[M.B. Naegle]

If you have any 4DP, I'm interested. I've got a 5"x120" gear rack in my future, so multiples would be helpful.

 

[4GSR]

I'm also interested in any other cutters you may have, too.

 

[gbent]

Rack is a straight sided cutter, involute not necessary.

 

[bob]

Here are a few more I found, they suffered in storage, 3DP 12-13T, 4DP 26-34, 4DP 55-135, 2DP 12-13 . Probably more there but place is in a helluva mess so did not see them. Any interest sen your zip and I will get shipping quote
Bob

 

[ratbldr427]

If you have any 4DP, I'm interested. I've got a 5"x120" gear rack in my future, so multiples would be helpful.

I was looking for rack gear cutters a few years ago and determined that my over head arbors and such would require an larger diameter cutter than standard to clear. I was looking for module so don't know if diametral are available. Don't know how all rack cutter machines are made but found some China made large od ones cheap that were made for overhead tooling.

 

[EmGo]

Don't know how all rack cutter machines are made

There's a couple different ways but one is milling across, then moving the blank to mill the next tooth, again, again, like in a horizontal with a crosswise head, automatically. I have a video somewhere, will try to find it.

They are still made, so the cutters are still made too.

There were attachments made for gear shapers that used a normal round shaper cutter while moving the rack blank in a straight line past it, too. That's probably not what you need

 

[ratbldr427]

There's a couple different ways but one is milling across, then moving the blank to mill the next tooth, again, again, like in a horizontal with a crosswise head, automatically. I have a video somewhere, will try to find it.

They are still made, so the cutters are still made too.

There were attachments made for gear shapers that used a normal round shaper cutter while moving the rack blank in a straight line past it, too. That's probably not what you need

Cross milling was what I was going to do however the arbor and support and ra head are parallel to the rack gear so the cutter radius has to be large enough for the tooling to clear each pass. I think that is what MB Naegle is trying to do. An angled rack might work with a standard cutter.
The particular 3 modx 40" rack I was working on cost 1,300 from the mfg. They failed yearly due to a poor design. Won't go into detail but the failure was always 3-4 teeth in the same area so I just ordered a cheap piece of standard rack cut to width and welded it in the place of the bad teeth.

 

[4GSR]

Okay guys, If anyone else can use the No. 1 8DP gear cutter, go for it! I decided I don't need it. Ken

 

[M.B. Naegle]

Cross milling was what I was going to do however the arbor and support and ra head are parallel to the rack gear so the cutter radius has to be large enough for the tooling to clear each pass. I think that is what MB Naegle is trying to do. An angled rack might work with a standard cutter.
The particular 3 modx 40" rack I was working on cost 1,300 from the mfg. They failed yearly due to a poor design. Won't go into detail but the failure was always 3-4 teeth in the same area so I just ordered a cheap piece of standard rack cut to width and welded it in the place of the bad teeth.

More or less, but I'm still sorting out how to make this rack with the machines I have on hand. The 120" rack is for the underside of a Plainer table (missing when I got it), and judging by the bolt pattern the rack was divided into 4 or 5 sections. Using my horizontal mills arbor in the conventional way (cutting teeth parallel to the table), I'll only be able to cut about 12" in from the end of a piece, so a right angle attachment of some sort would be helpful, or I find a shaper or slotting attachment and forget the rotary cutter, or just outsource it to someone with the right tools. Before I did that though I'd model it and cut it on one of our VMC's, but I'd rather not take up their time with this project.

 

[EmGo]

Using my horizontal mills arbor in the conventional way (cutting teeth parallel to the table), I'll only be able to cut about 12" in from the end of a piece, so a right angle attachment of some sort would be helpful,

I'd probably prefer to do it in three setups in a vertical, having long stuff stuck out in a horizontal and doing such short lengths is a pain ... just one pass through to clear out the middle, then tip the head one way and run through all the sections, then tip the other and do the same ... not really that bad once you get going. You could even get uptown and use a ball end or at least a radius, to give the root fillets a nice transition. The mating gear won't touch there but it looks nicer and makes the teeth stronger (like that's a problem in this case ? but what the heck).

 

[M.B. Naegle]

Cutters showed up without issue. Thanks!