Search found 139 matches

by ChipMaker4130
Fri Sep 13, 2019 2:32 pm
Forum: General Discussion
Topic: Used endmills
Replies: 13
Views: 481

Re: Used endmills

I think Mr Hoffman alluded to the key question: Do you need to sharpen the flutes or just the end? 'Touching up' the end isn't usually too big a job and in many cases, especially in a home shop, that's the part that gets dull.
by ChipMaker4130
Wed May 29, 2019 8:08 pm
Forum: General Discussion
Topic: Drilling UHMW
Replies: 6
Views: 2920

Re: Drilling UHMW

If accuracy is not an issue, you'll still be ahead time and fuss-wise just using a hole saw. Use the coarsest tooth one you can get and don't turn it fast and it won't be a problem. You can also flood it with coolant or even water. You will have to deal with a burr unless you cut part way through, t...
by ChipMaker4130
Mon Jan 28, 2019 10:39 pm
Forum: General Discussion
Topic: Best tap for aluminum
Replies: 12
Views: 2108

Re: Best tap for aluminum

If you can use a spiral-point tap it makes life a lot easier since the chip precedes the tap instead of getting bound up in the hole. I use them for all through-holes and on blind holes whenever I have enough material thickness to overdrill the depth sufficient to catch the chip. It can be a nuisanc...
by ChipMaker4130
Fri Dec 21, 2018 6:01 pm
Forum: General Discussion
Topic: Great service
Replies: 18
Views: 2788

Re: Great service

Gosh, Harold, I've never heard of such things with Enco. I dealt with them for a couple of decades and always received excellent service. Same now with MSC. Their people are very knowledgeable and friendly and their prices are actually pretty good if you happen to be an Enco transplant.
by ChipMaker4130
Fri Dec 14, 2018 9:32 pm
Forum: General Discussion
Topic: Tempering
Replies: 10
Views: 1981

Re: Tempering

Tempering temps depend on the material itself, and will vary by several hundred degrees for the same hardness in different materials. 420 is pretty low for a lot of them.
by ChipMaker4130
Fri Dec 14, 2018 10:34 am
Forum: General Discussion
Topic: Tempering
Replies: 10
Views: 1981

Re: Tempering

Magicniner wrote:
Fri Dec 14, 2018 7:52 am
Should be fine unless the data sheet for the material states a maximum tempering time.
This is my understanding as well. Normally its the temperature that's important, not the time (except that the time must be long enough).
by ChipMaker4130
Sun Dec 09, 2018 4:45 pm
Forum: General Discussion
Topic: key type chuck with R8 mount
Replies: 16
Views: 2254

Re: key type chuck with R8 mount

Oops. You are correct. I passed too quickly over the descriptions. Like others, in 50 years of using them I've never had a properly fitted Jacobs Taper spin. In fact, the main difficulty for me sometimes is getting them separated, even with a punch or wedge. I do have a very nice Accu-Pro (Spain) ke...
by ChipMaker4130
Sun Dec 09, 2018 12:35 pm
Forum: General Discussion
Topic: key type chuck with R8 mount
Replies: 16
Views: 2254

Re: key type chuck with R8 mount

There are several listed here: https://www.mscdirect.com/browse/tn/?searchterm=keyed+chuck+r8&hdrsrh=true#navid=4287782537&searchterm=keyed+chuck+r8&lh=n Although the retail prices shown are fairly high, if you happen to be a 'grandfathered' Enco customer these chucks are from $50 - $200+ cheaper th...
by ChipMaker4130
Sun Nov 25, 2018 12:37 pm
Forum: General Discussion
Topic: Steady rest Q
Replies: 9
Views: 1810

Re: Steady rest Q

Hey Rich, that's a beautiful solution! 50+ years of drilling and I've never heard anything like it. Gonna try it tomorrow.
by ChipMaker4130
Fri Sep 21, 2018 10:37 am
Forum: General Discussion
Topic: Why 27 TPI?
Replies: 12
Views: 3094

Re: Why 27 TPI?

SteveM wrote:
Fri Sep 21, 2018 8:07 am
. . .The thing is, with a standard American QC box, you CAN'T do 27tpi. . .
Just depends on the level of lathe. My mid-70's era Sheldon does 27, among a great many (59) other pitches.
On the other hand, I have to use change gears to cut metric threads.
by ChipMaker4130
Thu Sep 20, 2018 6:55 pm
Forum: General Discussion
Topic: oilless compressors
Replies: 16
Views: 3427

Re: oilless compressors

Some of the oil less compressors have outputs in excess of 3-400 lpm. Further they are advertised as quiet and are what is used in hospitals and so on. I think somethings gone skew here??? If you look at those, you'll find they are in the catagory of 'call us for pricing information'. These units a...
by ChipMaker4130
Sun Sep 16, 2018 9:19 pm
Forum: General Discussion
Topic: spot drill angles
Replies: 8
Views: 1421

Re: spot drill angles

. . .despite careful laying-out and center punching the workpieces, they seem determined to walk outside the punch when they first touch the workpiece. . . Spot drills have a very sharp 'point', even better than a split-point. They won't walk out of your punch mark, and the larger ones, say 3/8 and...