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Member postings for HOWARDT

Here is a list of all the postings HOWARDT has made in our forums. Click on a thread name to jump to the thread.

Thread: A question about reamers and hole tolerances.
16/05/2022 07:45:40

Can’t throw any more light on the table unfortunately. But in the past life I used to specify cutting tools for high volume production, all tools were specified to produce the required size, a proportion of the drawing tolerance. The actual tool size was normally towards the top end of the tolerance to allow for wear and regrinding. Reamers are available in at least two tolerances to produce either H7 or plus size holes, also dependant on material being cut.

As has been said make the parts to suit unless it is for someone else who specifies the size on a drawing.

Thread: pulley problem for electric motor for grinder.
13/05/2022 18:19:03

The holes without the screws in are for extraction of the hub. Take out the clamping screws and put them into the other holes to jack the hub off the pulley.

13/05/2022 15:48:03

Threads are BSW and the size depends on the taper lock number, they go from 1/4 in 1008 to 7/8 in 5040.

Thread: Drone advice needed, please
13/05/2022 15:42:39

As an alternative have a look at Promap.co.uk. A friend used there location mapping services when he worked creating updated building service plans. They can supply location maps and many other types of ariel views for a price, nothing to loose looking at the web site.

Thread: Milling Table Flatness - What is acceptable
11/05/2022 19:21:59

The problem is the ratio of width to length of the table support and gib. When the table is supported at the mid stroke it is in equal balance across it but as you move to full stroke the table will tend the overbalance. Also the alignment of the lead screw and nut can throw the table off causing it to swivel around as it is moved. Getting it all right is very much trial and error, tightening up the gib to strike the right balance of rigidity and free movement.

Thread: Tyres
09/05/2022 16:59:00

Probably overinflated to get the tyre to seat on the rim then some released but not enough to achieve correct riding pressure.

Thread: Another CAD challenge
06/05/2022 16:13:30

With Autodesk Fusion or Inventor it is simply a case of aligning and offsetting planes created in the individual parts. It is really a case of how you want to create the thing as other one part or two. Probably one part of you are 3D printing it and two if machining from solid, although you could machine in one on a CNC mill.

Thread: Locomotive threading
05/05/2022 20:14:10

In the UK it is cheaper to use metric threads for fasteners bought in the hundreds not in packs of ten. As the pipe fittings are based on small sizes then it is quite easy to work with ME threads and make fittings as industrial fittings in both metric and asp threads tend to be quite large. Living in Canada as you are then stick with what you can purchase locally, when I was designing machines for use in Canada some years ago metric fasteners where no problem. With your closeness to the USA you may get better prices by using UN threads. AT the end of the day it doesn't matter what thread form is used but as has been said you have to look at the AF of the fittings for fitting clearance.

Thread: Band saw arm weight
28/04/2022 08:09:06

I find if you apply too much force, wind the tension spring fully off, there is a tendency for the blade to snatch on break through causing the blade to be thrown off the wheels. This is more pronounced on wider flats rather than rounds where the cut lessens as you cut through. So a bit of trial and error with setting, but once set hardly needs touching again.

Thread: Stud bending on threading
26/04/2022 21:41:54

Ensure diameter is size to slightly under, if using a split die use the centre holder screw to open the die up, rotate the die onto the part with a little end pressure and use plenty of lubricant, then rotate the die down the part backing off every couple of full turns to break the swarf. The bending can be caused by forcing the die down the part it one go, this jams the swarf and can twist smaller diameters showing up as a bend along the length. Practice with a larger diameter thread, say M8, I regularly die down to M2 with little trouble.

Thread: Alternative Ways of Retaining Shafts
26/04/2022 16:56:25

As the circlip is just a stop could the groove be any width greater than the circlip.

Thread: Any tips for working at higher precision? e.g. Do you do this?
21/04/2022 08:59:28

In my training days taught to use a chisel point, H and 2H on paper then later used a flat lead Fedra Constructor refillable pencil. Only ever used to measure an original drawing, prints can vary in all directions, even plastic film is not temperature stable. Now a days all the drawings we handle are prints in one form or another. When lofting all done on heavy weight film everything was created with compass and straight edge as these were used for actual build comparison during checking finished parts, usual aircraft related.

Thread: Need a pen to draw the "finest possible" lines?
17/04/2022 16:50:40

Draughting (drafting) film, sometimes refereed to as Mylar. Seems to be plenty about, mostly in smaller sheet sizes. In my day I am sure we used two types as well as an ammonia processed print one for modifying copies. Definitely better to produce fine lines in ink than paper based products.

Thread: Redundancy, electrical
17/04/2022 11:47:58

I as others have stuck to vinyl and to a lesser degree CDs, I have never downloaded any music. It Is a question of ownership and long term storage, I still have a 78 rpm disc which I can still play which must be a 100 years old, try doing that with a download. Even cars these days are not immune to the software life limitations, if the Internet goes down how many vehicles will become non runners. Look at what happened during the severe storms we had recently, how many people went back to manual start generators and solid fuel fires.

Thread: Rexon SS-16SA scroll saw
17/04/2022 11:38:37

Looking at Axminster they have 59T blades, depends on wether the saw has pin or plain clamping. My saw has adaptors to take both types, not a Rexon. If I remember Axminster used to sell Rexon as I have a bench drill which I am sure I bought from them at a show at Warwick many moons ago.

Thread: Redundancy, electrical
16/04/2022 22:32:45

Just had to replace an Amazon Echo, 2nd generation, refused to allow connection to BBC Sounds app so no radio 4. Alright I know I can use a radio and do in the workshop but in certain circumstances it is convenient. Talking with the daughter she has the same problem with some similar age Echo devices. Now what I am coming to is with all the talk of repairabiliy to extend life of electrical items, what is the use of manufacturers ignore firmware updates on older devices to allow them to work. Whilst I can understand there will be limitations it seems manufacturers will continue to force us upgrade hardware before it reaches a mechanical end of life, Microsoft et al has been doing this for years. Will we ever get truly upgradeable devices in the future to negate all the electronic waste.

Thread: 3D-CAD Package Shootout - Cotton Reel Example
12/04/2022 12:33:17

I used AutoCad as 2D then Inventor for 3D, quickly got in the habit with Inventor of creating parts as they would be made ie starting with a basic block or round. Doing it this way I was sure that the part could be machined. When I started as a self employed contractor with firms that had just took up Inventor I saw many occasions when some feature were just impossible to produce. Whilst my approach may not have used the minimum of key strokes I could still edit it at the end.

Thread: Blobs on drawings
12/04/2022 08:28:01

Has been around all my 50 odd years in the DO. Ther are many options for the dimension line end connection to the leader, filled arrow, open arrow, slash, dot et al. The one chosen is set by company standard and industry choice, architects very often use the slash, while engineers use the closed arrow. Take you choice but stick to one, although in some circumstances a different form may be used on a drawing where the normal one used is too large for close dimension lines.

Thread: DRO readouts freezing when adding second scale
10/04/2022 15:51:59

Are both scales the same resolution?

Thread: Steam tube & fittings size for Stuart S50 and similar
10/04/2022 15:50:08

Have look at Keith Appleton's YouTube. He has just bought some pipe, 4mm OD for inlet, 5mm for exhaust. Note you can buy 10M lengths from plumbing suppliers much cheaper than small lengths if you intend to use it in the future,

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